#mySelfClearingDiv { /* put your regular css styles in here */ }

/*paste this stuff just below it to make it self-clearing */
#mySelfClearingDiv:after { content: "."; display: block; height: 0; clear: both; visibility: hidden; }
#mySelfClearingDiv { display: inline-block; _height: 1%; }
#mySelfClearingDiv { display: block; }

Usually when designing a site using floating elements in HTML/CSS, you need to an extra html element with the css style {clear:both;}. This method lets you apply styles to the container of the floating elements so that you don't have the headache of using a clearing div. This is cross-browser and IE6 friendly!

Make an HTML Container Clear Floating Child Elements Using Only CSS

CSS