Fixed position but relative to container

Question

I am trying to fix a div so it always sticks to the top of the screen, using:

position: fixed;
top: 0px;
right: 0px;

However,

Answer 1

Yes it is possible as long as you don't set the position (top or left, etc.) of your fixed element (you can still use margin to set a relative position, though). Simon Bos posted about this a while ago.

However don't expect fixed element to scroll with non-fixed relatives.

See a demo here.