This element is floating on the right side and has a aqua background. The right edge of the aqua box should be aligned with the right edge of the white box underneath. I.e., It should not overlap the padding or border of its red-background parent.

This headline has padding set to zero

Below this paragraph the red background should continue all the way to the black border. This is a link which changes color when the pointer hovers over it in a CSS2 User Agent..