index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, minimum-scale=1, initial-scale=1, user-scalable=yes">
  
    <title>BlingBling</title>
    <meta name="theme-color" content="#111111">

    <meta name="mobile-web-app-capable" content="yes">
  </head>
  <body>
    <button>Test</button>
    <button>Test2</button>
    <script src="src/index.js" type="module" defer></script>
    <script src="playground.js" type="module" defer></script>
  </body>
</html>