css set image transparency code example

Example 1: transparent background css

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;   
}

Example 2: have a transparent div on an image html

<html>
  <head>
    <style type="text/css">
      div.imageSub { position: relative; }
      div.imageSub img { z-index: 1; }
      div.imageSub div {
        position: absolute;
        left: 15%;
        right: 15%;
        bottom: 0;
        padding: 4px;
        height: 16px;
        line-height: 16px;
        text-align: center;
        overflow: hidden;
      }
      div.imageSub div.blackbg {
        z-index: 2;
        background-color: #000;
        -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
        filter: alpha(opacity=50);
        opacity: 0.5;
      }
      div.imageSub div.label {
        z-index: 3;
        color: white;
      }
    </style>
  </head>
    <body>
      <div class="imageSub" style="width: 300px;"> <!-- Put Your Image Width -->
        <img src="image.jpg" alt="Something" />
        <div class="blackbg"></div>
        <div class="label">Label Goes Here</div>
      </div>
    </body>
</html>

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