diff --git a/doc/upstream-training/source/slides/_assets/os_background.png b/doc/upstream-training/source/slides/_assets/os_background.png
index 9051404f..643f966f 100644
Binary files a/doc/upstream-training/source/slides/_assets/os_background.png and b/doc/upstream-training/source/slides/_assets/os_background.png differ
diff --git a/doc/upstream-training/source/slides/_static/custom.css b/doc/upstream-training/source/slides/_static/custom.css
index 76619aa8..16d99738 100644
--- a/doc/upstream-training/source/slides/_static/custom.css
+++ b/doc/upstream-training/source/slides/_static/custom.css
@@ -40,7 +40,7 @@ article h1 {
 }
 
 article h2 {
-    color: rgb(133,11,19);
+    color: rgb(215,31,56);
 }
 
 .slide-footer {
@@ -61,7 +61,7 @@ a.logabug {
 }
 
 .fa-bug {
-    color: #DA422F;
+    color: #D71F38;
 }
 
 .fa-bug:hover {
diff --git a/doc/upstream-training/source/slides/_static/os_logo_small.png b/doc/upstream-training/source/slides/_static/os_logo_small.png
index c4da6f3b..672f9302 100644
Binary files a/doc/upstream-training/source/slides/_static/os_logo_small.png and b/doc/upstream-training/source/slides/_static/os_logo_small.png differ