diff --git a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/cover-bg.jpg b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/cover-bg.jpg
new file mode 100644
index 000000000..6d7cad3ba
Binary files /dev/null and b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/cover-bg.jpg differ
diff --git a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/main.css b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/main.css
index 18dfe3803..01dadb310 100644
--- a/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/main.css
+++ b/ESP-IDF_Robot/tutorial/docs/build/simplepdf/_static/main.css
@@ -463,13 +463,13 @@ dl.class dl.field-list, dl.type dl.field-list, dl.function dl.field-list, dl.mem
     content: none; } }
 
 @page :first {
-  background: url(ESP32C3_Breadboard-Adapter.jpg) no-repeat center;
+  background: url(cover-ng.jpg) no-repeat center;
   background-size: cover;
   margin: 0; }
 
 @media screen {
   #cover {
-    background: url(ESP32C3_Breadboard-Adapter.jpg) no-repeat center;
+    background: url(cover-ng.jpg) no-repeat center;
     background-size: cover;
     margin: 0; } }
 
@@ -485,7 +485,7 @@ dl.class dl.field-list, dl.type dl.field-list, dl.function dl.field-list, dl.mem
     content: none; } }
 
 @page back_cover {
-  background: url(ESP32C3_Breadboard-Adapter.jpg) no-repeat center;
+  background: url(cover-ng.jpg) no-repeat center;
   background-size: cover;
   margin: 0;
   color: #ffffff; }
@@ -507,7 +507,7 @@ dl.class dl.field-list, dl.type dl.field-list, dl.function dl.field-list, dl.mem
   display: flex;
   flex-wrap: wrap;
   height: 297mm;
-  background: url(ESP32C3_Breadboard-Adapter.jpg) no-repeat center;
+  background: url(cover-ng.jpg) no-repeat center;
   background-size: cover;
   margin: 0; }
   #cover h1 {