How to realize the pop-up layer to cover the bottom layer in css

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The code is as follows:

# mcover {position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba (0,0,0,0.7); display: none; z-index: 20000;} # mcover img {position: fixed; right: 18px; top: 5px; width: 260pximportant; height: 180pximportant; z-index: 20001;}

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