title: Header width 100% and has margins and I want it on full width (also applies on top)
body: <p>My header is not displaying with 100% width (entire width of the screen), instead it has margins: top, left, right and I did not tell it to have.</p>
  
  <p><strong>CSS:</strong></p>
  
  <pre><code>div#header {
      background-color: #FF4800;
      float: top;
      height: 200px;
      width: 100%;
  }
  </code></pre>