title: How to shape border spikes in CSS
body: <p>I need to make the spikes with border like in the picture. Unfortunately I don't have the design, so no png or svg available. How can I make this in CSS? Is it even possible? I've been trying to make it all day, but the best I could come up with was a tutorial on how to make rounded zig zags in css and that's not even close to what I need. </p>
  
  <p>What would be the best way to accomplish this? I just need something to get me in the right direction. Thanks.<a href="https://i.stack.imgur.com/yGxkR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yGxkR.png" alt="enter image description here"></a></p>