DON’T USE OPACITY ON THE WHOLE DIV!

IT WILL MAKE THE TEXT AS WELL TRANSPARENT!

#someDiv {
    opacity: 0.8;
}

btw: OPAQUE is the opposite of TRANSPARENT

ONLY APPLY TO BACKGROUND:

#someDiv {
    background: none repeat scroll 0 0 rgba(255, 255, 255, 0.8);
}
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