index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <!--
      <link rel="stylesheet" href="/styles.css">
    -->
    <style>
      html, body, canvas{
        margin: 0px;
        padding: 0px;
        width: 100%;
        height: 100vh;
      }
    </style>
  </head>
  <body>
    <div id="app"></div>
    <div id="modal"></div>
    <script src="./index.jsx" type="module"></script>
  </body>
</html>