I have a two column layout, with a gray sidebar on the right. I need the sidebar\'s height to expand when the height of the left column is increased (due to content being dy
I'm guessing you want to apply certain effect to your layout such that it will require both columns to resize together. If you want to dynamically change the values of the height of the columns, I doubt it will work simply with css unless you implement some javascript to control the style.
As Dal suggested, do look at the link on faux columns. As the name suggests, the solution isn't much about modifying the columns height. Instead, it gives the "illusion" that both columns appear to be of the same height when in reality they are not -- and is with the use of tiles of background image.
The idea is there isn't a need to complicate the mark-up. Simple structure with a touch of "illusion" with images is a common practice in web design.
Regards, Jonah