index.html

<!DOCTYPE html>
<html lang="fr" dir="ltr">
  <head>
    <meta charset="utf-8" />
    <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" type="text/css" />
    <title>Modern Art Generator</title>
  </head>
  <body>
    <h1>Modern Art Generator</h1>
    <canvas id="art" width="600" height="400"></canvas>
    <br>
    <button onclick="randomize()">Randomizer !</button>

    <br><br>

    <table>
      <tr>
        <td><input type="checkbox" id="circles" onclick="drawCircles()"/></td>
        <td>Add me some circles</td>
      </tr>
      <tr>
        <td><input type="checkbox" id="squares" onclick="drawSquares()"/></td>
        <td>SQUARES !</td>
      </tr>
      <tr>
        <td><input type="checkbox" id="lines" onclick="drawLines()"/></td>
        <td>Lines please !</td>
      </tr>
    </table>

    <script src="art.js"></script>
  </body>
</html>