I've refreshed multiple times, even done a hard refresh, and I'm still getting non-uniform borders (extra bottom padding) and as a result a member card that looks quite ugly. Are you distributing the CSS through a CDN?
We are using an image to accomodate older browsers that can't scale things quickly, given the effect we use where the overlay grows out of the clicked link.
Other overlays that just fade in and out are 100% CSS.