index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Puzzle Game</title>
    <link rel="stylesheet" href="assets/css/style.css" />
    <link
      rel="shortcut icon"
      href="assets/img/jigsaw.png"
      type="image/x-icon"
    />
  </head>
  <body>
    <div class="wrapper">
      <div class="puzzle"></div>
      <div class="control">
        <div>
          <button class="active">Easy</button>
        </div>
        <div>
          <button>Medium</button>
        </div>
        <div>
          <button>Hard</button>
        </div>
        <div>
          <button>Harder</button>
        </div>
      </div>
    </div>

    <script src="app.js"></script>
  </body>
</html>