Since div’s by default are block elements – meaning they will occupy full available width, try using –
display:inline-block;
The div is now rendered inline i.e. does not disrupt flow of elements, but will still be treated as a block element.
I find this technique easier than wrestling with floats.
See this tutorial for more – http://learnlayout.com/inline-block.html. I would recommend even the previous articles that lead up to that one. (No, I did not write it)