Question

I am having trouble diagnosing what is causing a gap in a section of my page. I searched SO and Google, however I could not pinpoint any helpful articles. I have a container which contains a title, an unordered list and a div with information. The problem is a gap is occurring between the div and the ul. I would like the div to be directly under the ul with no spaces. An example can be seen here: http://jsfiddle.net/aAfU5/1/ (Remember IE7)

HTML

<div id="center-panel">
  <h1>Information</h1>
    <ul class="clearfix">
      <li class="bg1 border2">Regulation</li>
      <li class="bg1 border2">Compliance</li>
      <li class="bg1 border2">Resources</li>
    </ul>
    <div id="information-panel" class="border2">
      This is where the content goes
    </div>
  </div>

CSS:

    #center-panel {
        height: 300px;
        float: left;
        width: 78%;
        padding: 5px;
    }

    #center-panel ul {
        padding: 0px;
        margin: 0px;
    }

    #center-panel li {
        color: white;
        /*display:inline-block;*/
        /*display:inline;*/
        float: left;
        font-weight: bold;
        list-style-type: none;
        margin: 0px 2px;
        padding: 3px;
        width: 100px;
    }

    #information-panel {
        clear: both;
        margin: 0px 2px;
    }

    h1 {
        margin: 0 0 10px 0;
        padding: 0;
        font-size: 120%;
        color: #01305E;
    }

    .bg1 {
        background: #3C698E;
    }

    .border2 {
        border: 1px solid #01305E;
    }

Answer 1

It’s your H1 margin that “spills” under the ul.
Replace it with a padding :

h1 {
  margin: 0;
  padding: 0px 0px 10px 0px;
  font-size: 120%;
  color: #01305E;
}

You could also add zoom to trigger haslayout

#center-panel ul {
  padding: 0px;
  margin: 0px;
  zoom:1;
 }