title: Background: color does not work in IE8
body: <pre><code>body {
      background: gray; 
      font-family: sans-serif;
      width: 960px;
      margin: auto;
  }
  
  header {
      background: green;
      border: 10px solid black;
  }
  
  nav {
      margin-top:10px;
      background: #62D99C;
      border-radius: 10px;
      padding: 10px;
  }
  </code></pre>
  
  <p>Header and nav background does not work in IE8. It does work in Chrome and FF. What should I do?
  Thanks!</p>