title: Do the same in css 3
body: <p>Do you know How can I do the same "circle" in css 3?</p>
  
  <p>I tried double div with something like that :</p>
  
  <pre><code>border-radius:50%; 
  right:0; 
  top:50px; 
  width:200px; 
  height:200px;
  </code></pre>
  
  <p>The main div ( rectangle ) has an overflow set to hidden.</p>
  
  <p><img src="https://i.stack.imgur.com/F5BLv.png" alt="enter image description here"></p>