HTML
<div class="vignette">
</div>


CSS
.vignette {
  background: url("http://lorempixum.com/400/200/nature/5");
  width: 400px; height: 200px;
  -webkit-box-shadow:
    		inset 0 0 50px #000,
                inset 0 0 50px #000,
                inset 0 0 50px #000;

     -moz-box-shadow:
    		inset 0 0 50px #000,
                inset 0 0 50px #000,
                inset 0 0 50px #000;

          box-shadow:
    		inset 0 0 50px #000,
                inset 0 0 50px #000,
                inset 0 0 50px #000;
}