Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div class="c1">
    <div class="c2">
      <div class="circle">
      </div>
      <div class="c3">
        <div class="c4">
        </div>
      </div>
    </div>
  </div>
</body>
</html>