diff --git a/Introduction to Gazebo Sim with ROS2/1.3   Graphical User Interface.html b/Introduction to Gazebo Sim with ROS2/1.3   Graphical User Interface.html
index 16ca445..1ad5c20 100644
--- a/Introduction to Gazebo Sim with ROS2/1.3   Graphical User Interface.html	
+++ b/Introduction to Gazebo Sim with ROS2/1.3   Graphical User Interface.html	
@@ -13397,7 +13397,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">gazebo_sim_course_files</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">gazebo_sim_course_files</span>
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     </div>
@@ -13410,7 +13410,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">gz</span> <span class="n">sim</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">gazebo_sim_course_files</span><span class="o">/</span><span class="n">demo_world_unit1</span><span class="o">.</span><span class="n">sdf</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">gz</span> <span class="n">sim</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">gazebo_sim_course_files</span><span class="o">/</span><span class="n">demo_world_unit1</span><span class="o">.</span><span class="n">sdf</span>
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diff --git a/Introduction to Gazebo Sim with ROS2/2.3   Creating a Mobile Robot.html b/Introduction to Gazebo Sim with ROS2/2.3   Creating a Mobile Robot.html
index d2e7ec2..ab598a1 100644
--- a/Introduction to Gazebo Sim with ROS2/2.3   Creating a Mobile Robot.html	
+++ b/Introduction to Gazebo Sim with ROS2/2.3   Creating a Mobile Robot.html	
@@ -13395,7 +13395,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span>
 </pre></div>
 
     </div>
@@ -13513,7 +13513,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span>
 </pre></div>
 
     </div>
@@ -13730,7 +13730,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span>
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     </div>
diff --git a/Introduction to Gazebo Sim with ROS2/2.4   Links and Joints.html b/Introduction to Gazebo Sim with ROS2/2.4   Links and Joints.html
index a377dee..4ae70a7 100644
--- a/Introduction to Gazebo Sim with ROS2/2.4   Links and Joints.html	
+++ b/Introduction to Gazebo Sim with ROS2/2.4   Links and Joints.html	
@@ -13517,7 +13517,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="p">;</span> <span class="n">colcon</span> <span class="n">build</span> <span class="o">--</span><span class="n">packages-select</span> <span class="n">robot_description</span><span class="p">;</span> <span class="n">source</span> <span class="n">install</span><span class="o">/</span><span class="n">setup</span><span class="o">.</span><span class="n">bash</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="p">;</span> <span class="n">colcon</span> <span class="n">build</span> <span class="o">--</span><span class="n">packages-select</span> <span class="n">robot_description</span><span class="p">;</span> <span class="n">source</span> <span class="n">install</span><span class="o">/</span><span class="n">setup</span><span class="o">.</span><span class="n">bash</span>
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     </div>
@@ -13687,7 +13687,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="p">;</span> <span class="n">colcon</span> <span class="n">build</span> <span class="o">--</span><span class="n">packages-select</span> <span class="n">robot_description</span><span class="p">;</span> <span class="n">source</span> <span class="n">install</span><span class="o">/</span><span class="n">setup</span><span class="o">.</span><span class="n">bash</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="p">;</span> <span class="n">colcon</span> <span class="n">build</span> <span class="o">--</span><span class="n">packages-select</span> <span class="n">robot_description</span><span class="p">;</span> <span class="n">source</span> <span class="n">install</span><span class="o">/</span><span class="n">setup</span><span class="o">.</span><span class="n">bash</span>
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     </div>
diff --git a/Introduction to Gazebo Sim with ROS2/2.5   Meshes.html b/Introduction to Gazebo Sim with ROS2/2.5   Meshes.html
index 5b95196..8540e65 100644
--- a/Introduction to Gazebo Sim with ROS2/2.5   Meshes.html	
+++ b/Introduction to Gazebo Sim with ROS2/2.5   Meshes.html	
@@ -13428,7 +13428,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">mkdir</span> <span class="o">-</span><span class="n">p</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">meshes</span><span class="o">/</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">mkdir</span> <span class="o">-</span><span class="n">p</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">meshes</span><span class="o">/</span>
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diff --git a/Introduction to Gazebo Sim with ROS2/2.6   Spawn the Robot using Gazebo Sim service.html b/Introduction to Gazebo Sim with ROS2/2.6   Spawn the Robot using Gazebo Sim service.html
index d2404ca..612fe41 100644
--- a/Introduction to Gazebo Sim with ROS2/2.6   Spawn the Robot using Gazebo Sim service.html	
+++ b/Introduction to Gazebo Sim with ROS2/2.6   Spawn the Robot using Gazebo Sim service.html	
@@ -13418,7 +13418,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=</span><span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">urdf</span><span class="p">:</span><span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=</span><span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">urdf</span><span class="p">:</span><span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span>
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     </div>
@@ -13617,7 +13617,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">urdf</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">urdf</span>
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diff --git a/Introduction to Gazebo Sim with ROS2/2.7   Spawn the robot using ROS2 Launch File.html b/Introduction to Gazebo Sim with ROS2/2.7   Spawn the robot using ROS2 Launch File.html
index aa61843..15250ae 100644
--- a/Introduction to Gazebo Sim with ROS2/2.7   Spawn the robot using ROS2 Launch File.html	
+++ b/Introduction to Gazebo Sim with ROS2/2.7   Spawn the robot using ROS2 Launch File.html	
@@ -13387,7 +13387,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">touch</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">launch</span><span class="o">/</span><span class="n">empty_world</span><span class="o">.</span><span class="n">launch</span><span class="o">.</span><span class="n">py</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">touch</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">launch</span><span class="o">/</span><span class="n">empty_world</span><span class="o">.</span><span class="n">launch</span><span class="o">.</span><span class="n">py</span>
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     </div>
@@ -13558,7 +13558,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span>
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     </div>
@@ -13708,7 +13708,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span>
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diff --git a/Introduction to Gazebo Sim with ROS2/3.7   Robot Gazebo Tags.html b/Introduction to Gazebo Sim with ROS2/3.7   Robot Gazebo Tags.html
index 8a39843..1e69ecd 100644
--- a/Introduction to Gazebo Sim with ROS2/3.7   Robot Gazebo Tags.html	
+++ b/Introduction to Gazebo Sim with ROS2/3.7   Robot Gazebo Tags.html	
@@ -13508,7 +13508,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span>
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@@ -13572,7 +13572,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="p">;</span> <span class="n">source</span> <span class="n">install</span><span class="o">/</span><span class="n">setup</span><span class="o">.</span><span class="n">bash</span><span class="p">;</span> <span class="n">ros2</span> <span class="n">launch</span> <span class="n">robot_description</span> <span class="n">spawn</span><span class="o">.</span><span class="n">launch</span><span class="o">.</span><span class="n">py</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="p">;</span> <span class="n">source</span> <span class="n">install</span><span class="o">/</span><span class="n">setup</span><span class="o">.</span><span class="n">bash</span><span class="p">;</span> <span class="n">ros2</span> <span class="n">launch</span> <span class="n">robot_description</span> <span class="n">spawn</span><span class="o">.</span><span class="n">launch</span><span class="o">.</span><span class="n">py</span>
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diff --git a/Introduction to Gazebo Sim with ROS2/3.8   Differential Drive Plugin.html b/Introduction to Gazebo Sim with ROS2/3.8   Differential Drive Plugin.html
index 95f286c..b145437 100644
--- a/Introduction to Gazebo Sim with ROS2/3.8   Differential Drive Plugin.html	
+++ b/Introduction to Gazebo Sim with ROS2/3.8   Differential Drive Plugin.html	
@@ -13489,7 +13489,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span>
 </pre></div>
 
     </div>
@@ -13553,7 +13553,7 @@ div#notebook {
 <div class="prompt input_prompt">In&nbsp;[&nbsp;]:</div>
 <div class="inner_cell">
     <div class="input_area">
-<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span>
+<button title="Copy this code" class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;"><i class="fa fa-clipboard" aria-hidden="true"></i></button><div class=" highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span>
 </pre></div>
 
     </div>
diff --git a/Introduction to Gazebo Sim with ROS2/4.11   Adding Models.html b/Introduction to Gazebo Sim with ROS2/4.11   Adding Models.html
index 57cd41e..6e1dbfa 100644
--- a/Introduction to Gazebo Sim with ROS2/4.11   Adding Models.html	
+++ b/Introduction to Gazebo Sim with ROS2/4.11   Adding Models.html	
@@ -13379,7 +13379,7 @@ div#notebook {
 <div class="prompt input_prompt">In [ ]:</div>
 <div class="inner_cell">
 <div class="input_area">
-<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span>
+<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span>
 </pre></div>
 </div>
 </div>
@@ -13507,7 +13507,7 @@ div#notebook {
 <div class="prompt input_prompt">In [ ]:</div>
 <div class="inner_cell">
 <div class="input_area">
-<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">models</span>
+<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">models</span>
 </pre></div>
 </div>
 </div>
@@ -13518,7 +13518,7 @@ div#notebook {
 <div class="prompt input_prompt">In [ ]:</div>
 <div class="inner_cell">
 <div class="input_area">
-<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">worlds</span>
+<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">worlds</span>
 </pre></div>
 </div>
 </div>
diff --git a/Introduction to Gazebo Sim with ROS2/4.12   Adding Actors.html b/Introduction to Gazebo Sim with ROS2/4.12   Adding Actors.html
index 4b034bf..357a323 100644
--- a/Introduction to Gazebo Sim with ROS2/4.12   Adding Actors.html	
+++ b/Introduction to Gazebo Sim with ROS2/4.12   Adding Actors.html	
@@ -13592,7 +13592,7 @@ div#notebook {
 <div class="prompt input_prompt">In [ ]:</div>
 <div class="inner_cell">
 <div class="input_area">
-<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">models</span>
+<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">export</span> <span class="n">GZ_SIM_RESOURCE_PATH</span><span class="o">=/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">models</span>
 </pre></div>
 </div>
 </div>
@@ -13603,7 +13603,7 @@ div#notebook {
 <div class="prompt input_prompt">In [ ]:</div>
 <div class="inner_cell">
 <div class="input_area">
-<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">worlds</span>
+<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span><span class="o">/</span><span class="n">worlds</span>
 </pre></div>
 </div>
 </div>
diff --git a/Introduction to Gazebo Sim with ROS2/4.2   SDF (SDFormat).html b/Introduction to Gazebo Sim with ROS2/4.2   SDF (SDFormat).html
index d2b1d9b..6a22c37 100644
--- a/Introduction to Gazebo Sim with ROS2/4.2   SDF (SDFormat).html	
+++ b/Introduction to Gazebo Sim with ROS2/4.2   SDF (SDFormat).html	
@@ -13380,7 +13380,7 @@ div#notebook {
 <div class="prompt input_prompt">In [ ]:</div>
 <div class="inner_cell">
 <div class="input_area">
-<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">gazebo_sim_ros2</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span>
+<button class="copy-code-btn" style="position: absolute; top: 5px; right: 5px;color: lightseagreen; font-weight: bold;" title="Copy this code"><i aria-hidden="true" class="fa fa-clipboard"></i></button><div class="highlight hl-ipython2"><pre translate="no"><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">workspace</span><span class="o">/</span><span class="n">src</span><span class="o">/</span><span class="n">robot_description</span>
 </pre></div>
 </div>
 </div>