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" />
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>Starter</title>
    <meta name="description" content="something" />
    <meta name="author" content="me" />
    <link href="style.css" rel="stylesheet"/>
    <style>

    </style>
  </head>
  <body class="container">
    <div id="sketch" class="flex-item"></div>
    <script
      src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.4.1/p5.min.js"
      integrity="sha512-NxocnqsXP3zm0Xb42zqVMvjQIktKEpTIbCXXyhBPxqGZHqhcOXHs4pXI/GoZ8lE+2NJONRifuBpi9DxC58L0Lw=="
      crossorigin="anonymous"
      referrerpolicy="no-referrer"
    ></script>
    <script src="index.js"></script>
  </body>
</html>