title: How to make a transparent border using CSS?
body: <p>I'm trying to do something like this for a client who has a blog.  </p>
  
  <p><img src="https://i.stack.imgur.com/4h31s.png" alt="http://i.stack.imgur.com/4h31s.png"></p>
  
  <p>She wanted a semi transparent border. I know that's possible with making it just a background. But I can't seem to find the logic/code behind this kind of css technique for banners. Does anybody know how to do this? It would be a lot of help because that's the look my client's wanting to achieve for his blog.... </p>