Can I set background image and opacity in the same property?

Question

I can see in CSS references how to set image transparency and how to set a background image. But how can I combine these two in order to set a transparent background image?<

Answer 1

You can use CSS psuedo selector ::after to achieve this. Here is a working demo.

.bg-container{
  width: 100%;
  height: 300px;
  border: 1px solid #000;
  position: relative;
}
.bg-container .content{
  position: absolute;
  z-index:999;
  text-align: center;
  width: 100%;
}
.bg-container::after{
  content: "";
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  z-index:-99;
  background-image: url(https://i.stack.imgur.com/Hp53k.jpg);
  background-size: cover;
  opacity: 0.4;
}

   

     
Background Opacity 0.4