Why does my footer background colour change when adding a float to a DIV element?

Bear with me as I am a student learning dreamweaver....
I am trying to insert a series of 4 DIVs into a footer area with a black background. WHen I insert a float to constrain them to a horizontal position, the black background disappears and the body background shows through. A strip of the footer displays on top of the area where the DIVs are placed. The float works but the problem is with the background colour. It's almost as if the divs have been pushed down below the footer area. I have tried placing my cursor in several locations before inserting the float but it doesn't change anything.
Can anyone help?

It all depends on the code you're working with.   In the following example, I applied overflow:hidden to the <footer> element.
Copy & paste this code into a new, blank HTML page to see how it works.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>HTML5 Layout</title>
<style type="text/css">
body {
    font: 100%/1.4 Verdana, Arial, Helvetica, sans-serif;
    background-color: #CCC;
    padding: 0;
    color: #000;
    width: 1000px;
    margin: 45px auto;
header {width: 100%; display:block; background: #A5C9C9; min-height: 100px}
section {width: 100%; display:block; background:#FFF; min-height: 300px}
footer {width: 100%; display:block; background: #FF9; overflow:hidden;}
aside {width: 22%; float:left; display:block; margin-right: 4%; background:#D8E9B6; min-height: 200px;}
aside:last-child {margin-right:0}
</style>
</head>
</body>
<header>
<h1>Content for header goes here</h1>
</header>
<section>Content for section goes here</section>
<footer>
    <aside>aside 1</aside>
    <aside>aside 2</aside>
    <aside>aside 3</aside>
    <aside>aside 4</aside>
</footer>
</body>
</html>
Nancy O.

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