diff --git a/static/css/core/layout.css b/static/css/core/layout.css
index 452ba6d..804cd03 100644
--- a/static/css/core/layout.css
+++ b/static/css/core/layout.css
@@ -589,7 +589,8 @@
 /* Mode Navigation Bar */
 .mode-nav {
     display: none;
-    background: var(--bg-tertiary);
+    background: #151a23; /* Explicit color to ensure consistency across all pages */
+    background: var(--bg-tertiary, #151a23);
     border-bottom: 1px solid var(--border-color);
     padding: 0 20px;
 }
diff --git a/static/css/index.css b/static/css/index.css
index e62208b..9518f16 100644
--- a/static/css/index.css
+++ b/static/css/index.css
@@ -640,7 +640,8 @@ header h1 {
 /* Mode Navigation Bar */
 .mode-nav {
     display: none;
-    background: var(--bg-tertiary);
+    background: #151a23; /* Explicit color for consistency */
+    background: var(--bg-tertiary, #151a23);
     border-bottom: 1px solid var(--border-color);
     padding: 0 20px;
 }