html - Change background image opacity with css -

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i want change header's background image opacity css. me please.

.intro {    display: table;    width: 100%;    height: auto;    padding: 100px 0;    text-align: center;    color: #fff;    background: url(http://lorempixel.com/1910/500/nature/) no-repeat bottom center scroll;    background-color: #000;    -webkit-background-size: cover;    -moz-background-size: cover;    background-size: cover;    -o-background-size: cover;  }
<header class="intro">    ...  </header>

you can change opacity in programs photoshop or gimp.

or can opacity in css. don't want since have content in .intro affected it.

so suggest following solution

.intro {     position: relative;     z-index: 0;     display: table;     width: 100%;     height: auto;     padding: 100px 0;     text-align: center;     color: black;     background-color: transparent;     -webkit-background-size: cover;     -moz-background-size: cover;     background-size: cover;     -o-background-size: cover; }   .intro:after {     content : "";     display: block;     position: absolute;     top: 0;     left: 0;     background: url('http://www.planwallpaper.com/static/images/canberra_hero_image.jpg');      background-size: cover;     width: 100%;     height: 100%;     opacity : 0.2;     z-index: -1; }

https://jsfiddle.net/q63nf0la/

basically add :after element background image , position absolute ( .intro need position:relative; ) , set z-index , opacity.


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