Alexander Haztar

<div class="bg">
  <h1>Text</h1>
</div>

.bg{
 background:url(http://i.imgur.com/jo5Flh3.jpg) no-repeat;
  width:400px;
  height:400px;
  position:relative;
}
.bg:after{
  background:#333;
  content:' ';
  top:0;
  bottom:0;
  left:0;
  right:0;
  position:absolute;
  z-index:0;
  opacity:0.7;
}
.bg *{
  z-index:1;
  position:relative;
  color:#fff;
}