title: How do I make a DIV's background color spread the whole screen
body: <p>I want to make the background color of a div bleed whole width and height of a screen at any size??</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;body&gt;
      &lt;div id="header-BG"&gt;&lt;/div&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>CSS:</p>
  
  <pre><code>body {
      }
  
  #header-BG{ 
  
  /* content */
  
  }
  </code></pre>