css background image png transparent code example

Example 1: transparent background css for image

background-color: rgba(255, 0, 0, 0.5);

Example 2: png image background transparent css

body { 
  background-color: transparent;
}

Example 3: css background image opacity

/*
  You have to fake it, as there is no such property
*/

div {
  width: 200px;  /* Image Width */
  height: 200px; /* Image Height */
  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;   
}