Firefox: How to Grayscale an Entire Page without breaking fixed-positioned elements?
问题 Why do CSS filters, (ones that seem to have nothing to do with size/positioning) break your ability to give descendant-elements a fixed position? In addition to answering this question, please suggest a solution that addresses the problem I showcase below. The CSS and HTML below simply produces a little red box in the center of the viewport: #box { background: red; color: white; display: inline-block; border: solid #333333 10px; padding: 5px; position: fixed; top: 50%; left: 50%; transform: