<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{margin: 0; padding: 0}
.box{ width: 400px; height: 300px; background: #000; }
.box img{width: 400px; height: 300px;border:none;-webkit-mask:-webkit-linear-gradient(rgba(0,0,0,1),rgba(0,0,0,1),rgba(0,0,0,0.1));}
</style>
</head>
<body>
<div class="box">
<img src="http://p3.so.qhimg.com/sdr/960_768_/t01fb9758151f5e91cd.jpg">
</div>
</body>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{margin: 0; padding: 0}
.box{ width: 400px; height: 300px; background: #000; }
.box img{width: 400px; height: 300px;border:none;-webkit-mask:-webkit-linear-gradient(rgba(0,0,0,1),rgba(0,0,0,1),rgba(0,0,0,0.1));}
</style>
</head>
<body>
<div class="box">
<img src="http://p3.so.qhimg.com/sdr/960_768_/t01fb9758151f5e91cd.jpg">
</div>
</body>
</html>