diff --git a/prototype/UI/index.html b/prototype/UI/index.html
index 0013be944..1fa35fc53 100644
--- a/prototype/UI/index.html
+++ b/prototype/UI/index.html
@@ -7,12 +7,10 @@
         width: 50%;
     }
     #before {
-        margin-right: 50%;
         float: left;
         background-color: #ffecec;
     }
     #after {
-        margin-left: 50%;
         float: right;
         background-color: #eaffea;
     }