title: Twitter Bootstrap Responsive Navigation (btn-navbar, icon-bar) color changes
body: <p>I'm working with Bootstrap and focusing on the mobile navigation. When hovered over, the icon (three horizontal lines) has a grey background color; however, the background color only goes halfway up the icon (see image). I don't mind this background color but I'd like to to be over the full icon with rounded edges on top as they are on the bottom. How can I make this happen? Any ideas/suggestions appreciated.</p>
  
  <p><img src="https://i.stack.imgur.com/WfpJA.png" alt="enter image description here"></p>