title: Stack two circles relatively positioned in CSS
body: <p>Can anyone help me to realize this kind of circles with foundation<a href="https://i.stack.imgur.com/Ezz0l.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ezz0l.png" alt="enter image description here"></a>:</p>
  
  <p>I am so hopeless. These circles must be responsive.</p>