src/index.html


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<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script type="module" src="index.js"></script>
    <style>
      html,
      body {
        margin: 0;
      }

      div#throwable {
        position: fixed;
        transform: translate(-50%, -50%);
        background-color: red;
        border-radius: 50%;
      }
    </style>
  </head>
  <body>
    <div id="throwable"></div>
  </body>
</html>