How to vertically stack div elements from bottom to top?

[GoodhdMoviedl]

I am trying to stack 2 \[code\]div\[/code\]s on top of each other (that is, from bottom up).The bottom one has dynamic height, I want the top div to be stacked on it accordingly.I want them to be from \[code\]bottom: 0\[/code\] and up. not from up to bottom