Added a high z-index to the compact tooltip

/fixes #119

Author: wouterj

Resources/views/Form/fields.html.twig

@@ -55,6 +55,7 @@
             box-shadow:0 1px 2px #888;
             background:#fff;
             padding:10px;
+            z-index:9999;
         }
         </style>
         {% endif %}