index.html

<html>

<head>

  <meta charset="UTF-8">

  <script src="http://localhost:8081/socket.io/socket.io.js"></script>
  <script language="javascript" src="libraries/p5.js"></script>
  <script language="javascript" src="sketch.js"></script>
  <script language="javascript" src="functions.js"></script>

  <style>
    body {
      padding: 0;
      margin: 0;
      display: flex;

      /* This centers our sketch horizontally. */
      justify-content: center;

      /* This centers our sketch vertically. */
      align-items: center;

      background-color: black;
    }
  </style>

</head>

<body>

</body>

</html>