diff --git a/src/Whoops/Resources/css/whoops.base.css b/src/Whoops/Resources/css/whoops.base.css
index da00084..8695609 100644
--- a/src/Whoops/Resources/css/whoops.base.css
+++ b/src/Whoops/Resources/css/whoops.base.css
@@ -140,7 +140,8 @@ header {
       height: 18px;
       width: 18px;
       line-height: 18px;
-      border-radius: 100%;
+      border-radius: 5px;
+      padding: 0 1px 0 1px;
       text-align: center;
       display: inline-block;
     }