title: How to implement angle borders in css
body: <p><a href="https://i.stack.imgur.com/5uvTl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5uvTl.png" alt="enter image description here"></a></p>
  
  <p>I want to make four angle borders for a div like the picture shows. I saw someone use <code>&lt;fieldset&gt;</code> to hide part of a border, but that's not what I want. Is there a simple way to achieve this?</p>