How do you make a div shaped like an ellipse in CSS? : <p>I am trying to make the following shapes with css. I don't know how I can do this, can you help?</p>

<p><a href="https://i.stack.imgur.com/TnFna.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TnFna.png" alt="ellipse divs"></a></p>
