EASY CSS Issue I am overlooking:

Probably due to my lack of sleep, but can you help me with this rather simple css command I am missing?

I have the following code:

.module_head {
background-color: #4278D3;
font-size: 18px;
font-weight: bold;
color: #FFFFFF;
height:20px;
float:left;
padding:5px 0 5px 5px;
margin:0 0 10px;
}

And the above code is making the text that should come underneath show up directly after the div heading, so it is throwing everything apart because of this. I am missing a display I think. Inline? Block?

You can see a working example of this here:

[url]http://mibsolutionsllc.com/med/public_html/[/url]

It is the blue headings where I am having the problem, especially in the left sidebar.

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