--- a/css/tram-im.css	Wed Jun 01 21:26:22 2016 +0800
+++ b/css/tram-im.css	Wed Jun 01 21:48:43 2016 +0800
@@ -154,10 +154,12 @@
 }
 li.contact {
     padding: 5px;
+    border-left-style: solid;
+    border-left-width: 0;
+    transition: border-left-width 0.1s ease-in-out;
 }
 li.contact.active {
     border-left-width: 5px;
-    border-left-style: solid;
 }
 li.contact > .column {
     vertical-align: middle;