<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.img_div {
margin: 20px 400px 0 400px;
position: relative;
width: 531px;
height: 354px;
}
.mask {
position: absolute;
top: 0;
left: 0;
width: 531px;
height: 354px;
background: rgba(101, 101, 101, 0.6);
color: #ffffff;
opacity: 0;
}
.mask h3 {
text-align: center;
}
.img_div a:hover .mask {
opacity: 1;
}
</style>
</head>
<body>
<div class="img_div">
<img src="http://a4.att.hudong.com/21/09/01200000026352136359091694357.jpg">
<a href="#">
<div class="mask">
<h3>A Picture of food</h3>
</div>
</a>
</div>
</body>
</html>
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