<!DOCTYPE html>
<html>
<style>
  .container {
    width: 200px;
    height: 200px;
    background-color: green;
    clip-path: path('M 0 150 L 15,75 A 5,5 0,0,1 150,75 L 150 150 z');
  }
</style>

<body>
  <div class="container"></div>
</body>

</html>
