index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8"/>
  <meta content="width=device-width, initial-scale=1.0" name="viewport"/>
  <title>Vue3 Responsive Grid Layout</title>
  <link href="https://cdn.rawgit.com/Chalarangelo/mini.css/v3.0.1/dist/mini-default.min.css" rel="stylesheet">
</head>

<body>
<div id="app"></div>

<script src="./sandbox/main.ts" type="module"></script>
</body>
</html>