Fix text add by :before overlayed issue

modules/universal_table/index2.html.erb

@@ -47,6 +47,10 @@
        content: "No.";
     }
 
+    .universal-table-index thead > tr > th:first-child:before {
+       width: 4em;
+    }
+
     .universal-th-icon {
       border: 1px solid #eee;
       padding: 5px 8px;