Fix for codesandbox.io env (code review change)

examples/templates/example.html

@@ -197,9 +197,7 @@
     <script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"></script>{{#if extraHead.remote}}
 {{ indent extraHead.remote spaces=4 }}{{/if}}
-    <style>
-    @import "node_modules/ol/ol.css";
-    </style>
+    <link rel="stylesheet" href="node_modules/ol/ol.css">
     <style>
       .map {
         width: 100%;