title: CSS How to set div height 100% minus nPx
body: <p>I have a wrapper div which contans 2 divs next to each other. Above this container I have a div that contains my header. The wrapper div must be 100% minus the height of the header. The header is about 60 px. This is fixed. So my question is: how do I set the height my wrapper div to be 100% minus the 60 px?</p>
  
  <pre><code>&lt;div id="header"&gt;&lt;/div&gt;
  &lt;div id="wrapper"&gt;
    &lt;div id="left"&gt;&lt;/div&gt;
    &lt;div id="right"&gt;&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>