Place a button right aligned

Answer 1

Which alignment technique you use depends on your circumstances but the basic one is float: right;:

You'll probably want to clear your floats though but that can be done with overflow:hidden on the parent container or an explicit

at the bottom of the container.

For example: http://jsfiddle.net/ambiguous/8UvVg/

Floated elements are removed from the normal document flow so they can overflow their parent's boundary and mess up the parent's height, the clear:both CSS takes care of that (as does overflow:hidden). Play around with the JSFiddle example I added to see how floating and clearing behave (you'll want to drop the overflow:hidden first though).