毛玻璃效果

<body>
    <div class="wrapper">
        <div class="pic">
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        </div>
    </div>
</body>

.wrapper,.pic:before{
    background: url("http://www.officedoyen.com/uploads/allimg/150303/1-150303194244Q5.jpg") 0 / cover fixed;
}

.wrapper{
    text-align: center;
    padding: 100px;
    margin: 20px;
}
.pic{
    height: 550px;
    width: 550px;
    color: #fff;
    font-size: 20px;
    padding-top: 20px;
    background-color: rgba(255,255,255,0.5);
    margin: auto;
    position: relative;
    overflow: hidden;
    border-radius: 0.3em;
    z-index: 1;
}

.pic:before{
    content: '';
    position: absolute;
    z-index: -1;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: -30px;
    -webkit-filter: blur(10px);
    filter: blur(10px);
}

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