Is there a way to make the following:
#id {
  border-radius: 100px;
  width: 100px;
  height: 100px;
}<div id="circle">
  <h3>Hello</h3>
</div>A round div with the text centered vertically and horizontally. At the same time keeping the circle responsive.
By that I mean having a width of say 50% of the containing div, at the same time keeping the height percentage equal as to make a circle. 
And changing the static 100px to pertentages makes the circle oval.
 
     
     
     
     
    