diff --git a/css/main.css b/css/main.css
index cd8f6bc..e65a2eb 100644
--- a/css/main.css
+++ b/css/main.css
@@ -37,9 +37,9 @@ body {
   stroke-width: 2px;
 }
 
-.frame { width: 100%; height: 185px; padding: 4px; border: 2px solid black; }
+.frame { width: 100%; height: 185px; padding: 4px; border: 2px solid black; background-color: #EEEEEE;}
 .frame .slidee { margin: 0; padding: 0; height: 100%; list-style: none; }
-.frame .slidee li { float: left; margin: 0 5px 0 0; padding: 0; width: 150px; height: 100%; border: 2px solid gray; }
+.frame .slidee li { float: left; margin: 0 5px 0 0; padding: 0; width: 150px; height: 100%; border: 2px solid gray; background-color: white; }
 
 .scrollbar {
     width: 100%;