Change fixed position on scroll

Relative positioning is the first position type we'll take a look at. This is very similar to static positioning, except that once the positioned element has taken its place in the normal layout flow, you can then modify its final position, including making it overlap other elements on the page. ModalPopUpExtender - Locked in fix position. Cannot scroll to access objects beyond current page size. ... is LOCKED in a fixed position and will not scroll with the ... /* The sticky class is added to the header with JS when it reaches its scroll position */.sticky { position: fixed; top: 0; width: 100%} /* Add some top padding to the page content to prevent sudden quick movement (as the header gets a new position at the top of the page (position:fixed and top:0) */.sticky + .content