记录一下box-shadow的扩展使用。利用多投影（倾斜投影与主体投影）重叠的原理，实现曲线阴影与翘边阴影的效果:
慕课网视频地址
　　效果图:img

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>img wall</title>

    <link rel="stylesheet" href="img.css">

</head>
<body>

<div class="wrap effect">
    <h1>shadow effect</h1>
</div>
<ul class="box">
    <li><img src="./img/photo1.jpg" alt=""></li>
    <li><img src="./img/photo2.jpg" alt=""></li>
    <li><img src="./img/photo3.jpg" alt=""></li>
</ul>
</body>
</html>

img.css

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body{
    font-family: Arial;
    font-size: 23px;
}
.wrap h1{
    text-align: center;
    position: relative;
    top: 50px;
}
.wrap{
    width: 70%;
    height: 200px;
    background: #fff;
    margin: 40px auto;

}
.effect{
    position: relative;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3),0 0 40px rgba(0,0,0,0.1) inset;
}
.effect:before,.effect:after{
    content: '';
    z-index: -1;
    position: absolute;
    box-shadow: 0 0 20px rgba(0,0,0,0.8) ;
    top:50%;
    bottom: 0;
    left: 10px;
    right: 10px;
    border-radius: 100px/10px;
}

.box{
    width: 980px;
    height: auto;
    margin: 20px auto;
    padding:0;
    clear: both;
    overflow: hidden;
}
.box li{
    list-style-type: none;
    margin: 20px 10px;
    padding: 0;
    width: 300px;
    height: 220px;
    border: 2px solid #efefef;
    position: relative;
    float: left;
    background: #ffffff;
    line-height: 220px;
    -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27),0 0 60px rgba(0,0,0,0.1) inset;
    -moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.27),0 0 60px rgba(0,0,0,0.1) inset;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27),0 0 60px rgba(0,0,0,0.1) inset;
}

.box li img{
    width: 290px;
    height: 210px;
    padding: 5px;;
}

.box li:before{
    position: absolute;
    background: transparent;
    z-index: -1;
    width: 90%;
    height: 80%;
    content: '';
    left: 20px;
    bottom: 8px;
    transform: skew(-12deg) rotate(-4deg);
    -webkit-box-shadow: 0 8px 20px  rgba(0,0,0,0.6);
    -moz-box-shadow:  0 8px 20px  rgba(0,0,0,0.6);
    box-shadow:  0 8px 20px  rgba(0,0,0,0.6);
}

.box li:after{
    position: absolute;
    background: transparent;
    z-index: -1;
    width: 90%;
    height: 80%;
    content: '';
    left: 20px;
    bottom: 8px;
    transform: skew(12deg) rotate(4deg);
    -webkit-box-shadow: 0 8px 20px  rgba(0,0,0,0.6);
    -moz-box-shadow:  0 8px 20px  rgba(0,0,0,0.6);
    box-shadow:  0 8px 20px  rgba(0,0,0,0.6);
}