diff --git a/public/stylesheets/educoder/edu-main.css b/public/stylesheets/educoder/edu-main.css
index cee64aa7..6b8af902 100644
--- a/public/stylesheets/educoder/edu-main.css
+++ b/public/stylesheets/educoder/edu-main.css
@@ -1250,7 +1250,7 @@ html>body #ajax-indicator { position: fixed; }
     cursor: pointer;
 }
 
-.member_block{
+#member_block{
     height: 260px;
     overflow-y: auto;
 }
\ No newline at end of file