Curved header with pure CSS : <p>Trying to nail this curved header with pure CSS but using border radius isn't keeping the left &amp; right border edges as sharp as they are in the image. Any help would be appreciated.<a href="https://i.stack.imgur.com/Bj4ge.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Bj4ge.png" alt="Curved header"></a></p>
