Ye olde main content area
In this example, these two simple rules are applied to the div elements that contain the body text:
.floatclear { overflow:hidden; }* html .floatclear { height:1%; }
The rules make the document byline clear any floats in the body text, but not the sidebars. I've floated a few image and div elements to make it easier to verify whether it works. Resize your windows, scale the text up and down, do what you can to break it.
Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet.
Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet. Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet.
Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet.
Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet. Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet.
Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet.
Ut in magna. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed adipiscing. Lorem ipsum dolor sit amet.