Fix: Poped up the lint tooptip

lib/main.html

@@ -72,6 +72,10 @@
       border-left-color: rgba(142, 142, 142, 0.5);
       mix-blend-mode: difference;
     }
+
+    .CodeMirror-lint-tooltip {
+      z-index: 1003;
+    }
   </style>
 </head>