title: Background size cover is not working
body: <p>My PNG picture size is 1000px by 1000px.
  I use it as a background image in a DIV which has a height of 550px and a <code>background-size: cover</code> property.</p>
  
  <p>My issue is that this background-size cover does not seem to be working. My picture is not scaled down to the size of the DIV. What is the issue?</p>
  
  <p><a href="https://i.stack.imgur.com/cJU36.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cJU36.png" alt="enter image description here"></a></p>