<!DOCTYPE html>
<html>
  <head>
    <title>Canvas</title>
  </head>
  <body>
    <canvas id="canvas" width="300" height="300"></canvas>
    <div>
      <button id="clear">Wyczyść</button>
      <input id="opacity" type="range" min="0" max="1" value="1" step="0.1">
      <label for="opacity">Krycie</label>
    </div>
    <script src="script.js"></script>
  </body>
</html>
