title: Negative borders (css)
body: <p>I know how to make a border with css that looks like this:</p>
  
  <pre><code>    ___________
    _/           \_
   /               \
  |                 |
  |                 |
  </code></pre>
  
  <p>But is there a possibility to make a border that looks like that:</p>
  
  <pre><code>|\_             _/|
  |  \___________/  |
  |                 |
  |                 |
  </code></pre>
  
  <p>Thanks in advance!</p>