index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="ego king head" type="image/ico" href="/favicon.ico" />
    <title>Curse of the Ego King</title>
    <script src="https://kaboomjs.com/dist/kaboom.js"></script>
    <style>
      body,
      html {
        width: 100%;
        height: 100%;
      }

      main {
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
      }
      canvas {
        border-radius: 4px;
      }
    </style>
  </head>
  <body>
    <script src="main.js" type="module"></script>
    <main>
      <canvas id="canvas"></canvas>
    </main>
  </body>
</html>