diff --git a/themes/learn2/css/custom.css b/themes/learn2/css/custom.css
index cb65015..c1c23da 100644
--- a/themes/learn2/css/custom.css
+++ b/themes/learn2/css/custom.css
@@ -39,5 +39,5 @@ Put your custom CSS in this file.
 }
 
 #main {
-    background: #111111
+    background-color: #111111
 }