diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index 292af88a8..5a05798f7 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -1253,10 +1253,12 @@ display:block;
 position:absolute;
 top:12px; width:270px;
 border:1px solid #555;
+border-radius: 3px;
 background-color:#fff;
 padding: 4px;
 font-size: 0.8em;
 color:#505050;
+box-shadow: 0 1px 2px rgba(0,0,0,0.05);
 }
 
 table.cal div.tooltip:hover span.tip {