title: How to add image as background of block
body: <p>Can someone help me to understand what am i doing wrong? Want to add an image at the top center but it doesn't show anything. Here is a css code.Thank you.</p>
  
  <pre><code>div.header {
      background: url(photo/header.png) no-repeat ;
      display: block;
      width: 1002px;
      height:178px;
  } 
  </code></pre>