title: Expand <div> tag to bottom of page with CSS
body: <p>I know this question gets asked a lot because I have looked at many "solutions" trying to get this to work for me.  I can get it to work if I hack up the html but I want to use all CSS.  All I want is a header with two columns below it, and I want these three items to fill the entire page/screen, and I want to do it with CSS and without frames or tables.  The <a href="http://www.askaboutphp.com/wp-post-images/xampp-lite/xampp-home-page.png" rel="nofollow noreferrer">XAMPP user interface</a> looks exactly how I want my page to look, but again, I do not want to use frames.  I cannot get the two orangeish colored columns to extend to the bottom of the screen.  I do have it so it looks like the right column extends to the bottom of the screen just by changing the body background color to the same color as the background color of the right column, but I would like both columns to extend to the bottom so I didn't have to do that.  Here is what I have so far:</p>
  
  <p><strong>HTML</strong></p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  &lt;html dir="ltr" xmlns="http://www.w3.org/1999/xhtml"&gt;
  
  &lt;head&gt;
  &lt;title&gt;MY SITE&lt;/title&gt;
  &lt;meta content="text/html; charset=utf-8" http-equiv="Content-Type" /&gt;
  &lt;link href="stylesheet.css" rel="stylesheet" type="text/css" /&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
  
  &lt;div id="container"&gt;
  &lt;div id="masthead"&gt;
      MY SITE&lt;/div&gt;
      &lt;div id="left_col"&gt;
          Employee Management&lt;br /&gt;
          &lt;a href="Employee%20Management.php"&gt;Add New Employee&lt;/a&gt;&lt;br /&gt;
          &lt;a href="Employee%20Management.php"&gt;Edit Existing Employee&lt;/a&gt;&lt;br /&gt;
          &lt;br/&gt;
          Load Management&lt;br /&gt;
          &lt;a href="Load%20Management.php"&gt;Log New Load&lt;/a&gt;&lt;br /&gt;
  
          &lt;a href="Load%20Management.php"&gt;Edit Existing Load&lt;/a&gt;&lt;br /&gt;
          &lt;br/&gt;
          Report Management&lt;br /&gt;
          &lt;a href="Report%20Management.php"&gt;Employee Report&lt;/a&gt;&lt;br /&gt;
          &lt;a href="Report%20Management.php"&gt;Load Report&lt;/a&gt;&lt;/div&gt;
  
  
      &lt;div id="page_content"&gt;
          &lt;div id="page_content_heading"&gt;Welcome!&lt;/div&gt;
          Lots of words&lt;/div&gt;
  &lt;/div&gt;
  &lt;/body&gt;
  
  &lt;/html&gt;
  </code></pre>
  
  <p><strong>CSS</strong></p>
  
  <pre><code>#masthead {
      background-color:#FFFFFF;
      font-family:Arial,Helvetica,sans-serif;
      font-size:xx-large;
      font-weight:bold;
      padding:30px;
      text-align:center;
  }
  #container {
      min-width: 600px;
      min-height: 100%;
  }
  #left_col {
      padding: 10px;
      background-color: #339933;
      float: left;
      font-family: Arial,Helvetica,sans-serif;
      font-size: large;
      font-weight: bold;
      width: 210px;
  }
  #page_content {
      background-color: #CCCCCC;
      margin-left: 230px;
      padding: 20px;
  }
  #page_content_heading {
      font-family:Arial,Helvetica,sans-serif;
      font-size:large;
      font-weight:bold;
      padding-bottom:10px;
      padding-top:10px;
  }
  a {
      color:#0000FF;
      font-family:Arial,Helvetica,sans-serif;
      font-size:medium;
      font-weight:normal;
  }
  a:hover {
      color:#FF0000;
  }
  
  html, body {
      height: 100%;
      padding: 0;
      margin: 0;
      background-color: #CCCCCC;
  }
  </code></pre>