css z-index

i have writed this css code .overlay {position: fixed; background-color:#000; height: 100%; width: 100%; top:0; left: 0; z-index:9999 !important;
font-size: 60px; text-align: center; padding-top: 200px; color: #fff;}
but che top_bar can not hide, my div need to stay absolute in front, can you help me!

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