Improved notification counter style.

app/assets/stylesheets/zammad.css.scss

@@ -1835,11 +1835,11 @@ footer {
       min-width: 21px;
       position: absolute;
       right: -3px;
-      bottom: 6px;
+      bottom: 2px;
       padding: 0 4px;
-      font-size: 13px;
+      font-size: 12px;
       font-weight: 300;
-      line-height: 16px;
+      line-height: 15px;
       text-align: center;
       color: white;
       text-shadow: 0 1px 1px rgba(0,0,0,.21);