[html] How to make a parent div auto size to the width of its children divs

I'm trying to make the parent div only as wide as the child div's. Auto width is making the parent div fit the entire screen. The children divs will be different widths depending on their content so I need the parent div to adjust accordingly.

<div style='width:auto;'>
  <div style="width: 135px; float: left;">
    <h4 style="padding-right: 5px; padding-left: 15px;">Column1</h4>
    <dl style="padding-right: 5px; padding-left: 15px; margin-top: -8px; overflow-x: hidden;">
      <dd style="white-space: nowrap;">1</dd>
      <dd style="white-space: nowrap;">2</dd>
    </dl>

    <h4 style="padding-right: 5px; padding-left: 15px;">Column1</h4>
    <dl style="padding-right: 5px; padding-left: 15px; margin-top: -8px; overflow-x: hidden;">
      <dd style="white-space: nowrap;">1</dd>
      <dd style="white-space: nowrap;">2</dd>
    </dl>
  </div>

  <div style="width: 135px; float: right;">
    <h4 style="padding-right: 5px; padding-left: 10px;">Column2</h4>
    <dl style="padding-right: 5px; padding-left: 15px; margin-top: -8px; overflow-x: hidden;">
      <dd style="white-space: nowrap;">1</dd>
      <dd style="white-space: nowrap;">2</dd>
      <dd style="white-space: nowrap;">3</dd>
    </dl>
  </div>
</div>

The parent div (I assume the outermost div) is display: block and will fill up all available area of its container (in this case, the body) that it can. Use a different display type -- inline-block is probably what you are going for:

http://jsfiddle.net/a78xy/