title: CSS HTML - DIV height fill remaining space
body: <p>So I have a layout like this:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>div {
    border: 1px solid
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="col_1" style="float:left;width:150px;"&gt;1&lt;/div&gt;
  &lt;div id="col_2" style="float:left;width:100px;"&gt;2&lt;/div&gt;
  &lt;div id="col_3" style="float:left;width:&lt;REMAINING_WIDTH&gt;;"&gt;3&lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>col_1 and col_2 take up a fixed amount of space. I want the third column to take up the rest of it. What is the best way to do accomplish this?</p>