Background Image Opacity Fake Trick with CSS

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There is actually no such thing as “Background Opacity” but you can fake it with this CSS. Make the div behind the same size as the one in front and give the div behind a lower z-index and an opacity.

div {
  width: 200px;
  height: 200px;
  display: block;
  position: relative;
}

div::after {
  content: "";
  background: url(image.jpg);
  opacity: 0.5;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  position: absolute;
  z-index: -1;   
}
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