title: How to make such a button click effect?
body: <p>This effect is similar to a fast-growing rectangle. Because it’s clear that it’s not just round ripples. It even exists in the google play market as in video.</p>
  
  <ol>
  <li><a href="https://youtu.be/ttYRc_zem00" rel="nofollow noreferrer">https://youtu.be/ttYRc_zem00</a></li>
  <li><a href="https://youtu.be/8d-ki6kDgqg" rel="nofollow noreferrer">https://youtu.be/8d-ki6kDgqg</a></li>
  </ol>
  
  <p>How to do it using flutter?</p>
  
  <p>(RaisedButton, MaterialButton have ripple effect (circle), but not sort of rectangle compared to that)</p>