diff --git a/course_examples/masteryscore_responsive/style/base.css b/course_examples/masteryscore_responsive/style/base.css
index f89a3af..964e5a8 100644
--- a/course_examples/masteryscore_responsive/style/base.css
+++ b/course_examples/masteryscore_responsive/style/base.css
@@ -37,6 +37,7 @@ main {
     box-shadow: inset -2rem 0 2rem -2rem rgb(0 0 0 / 40%);
     overflow-y: auto;
     user-select: none;
+    z-index: 110;
 }
 
 .navcorner {
diff --git a/course_examples/single_au_basic_responsive/style/base.css b/course_examples/single_au_basic_responsive/style/base.css
index f89a3af..964e5a8 100644
--- a/course_examples/single_au_basic_responsive/style/base.css
+++ b/course_examples/single_au_basic_responsive/style/base.css
@@ -37,6 +37,7 @@ main {
     box-shadow: inset -2rem 0 2rem -2rem rgb(0 0 0 / 40%);
     overflow-y: auto;
     user-select: none;
+    z-index: 110;
 }
 
 .navcorner {