diff --git a/index.html b/index.html
index dbea728..3390b7a 100644
--- a/index.html
+++ b/index.html
@@ -57,7 +57,7 @@
       background-color: #45a049;  #333333
     }
 
-    source-btn:hover {
+   .source-btn:hover {
       background-color: #000000;
     }