title: Center navbar and add top/bottom-borders
body: <p>I want to center (automatically) the navbar on <a href="http://blueboxluxe.com/" rel="nofollow noreferrer">this site</a>. Also, I need to have a 1px border-top and 1px border-bottom that extends roughly 70% of the nav area.</p>
  
  <p>It should look like this mockup once it's done:</p>
  
  <p><img src="https://i.stack.imgur.com/cvyQH.png" alt="screen"></p>