How can I change a background image opacity without changing on div content? [duplicate]

Question

I want know that "How can I change background image opacity without changing on div content?"

I searched too much & I don't find a good answer to solve this issue!

HTML

<div class="div-1">
    <h2>title</h2>
    <p>text</p></div>

CSS

.div{
position:relative;
width:200px;
height:200px;
float:left;
color:white;
background:#7a8586 url('url') no-repeat local right;
overflow:hidden;
text-align: justify;
font-family:arial;
font-size:14px;}

Answer 1

DEMO

You can use after or before pseudo element for background-image.

Css:

.has-bg-img{
    position: relative;
}
.has-bg-img:after {
    content:'';
    background: url('http://placehold.it/500x100') no-repeat center center;
    position: absolute;
    top:0px;
    left: 0px;
    width:100%;
    height:100%;
    z-index:-1;
    opacity: 0.2; /* Here is your opacity */
}