<html>
<head>
<style type="text/css">
.img-preview{
-moz-border-bottom-colors: none;
-moz-border-left-colors: none;
-moz-border-right-colors: none;
-moz-border-top-colors: none;
border-bottom-color: #B8B8B8;
border-bottom-left-radius: 5px;
border-bottom-right-radius: 5px;
border-bottom-style: solid;
border-bottom-width: 1px;
border-image-outset: 0 0 0 0;
border-image-repeat: stretch stretch;
border-image-slice: 100% 100% 100% 100%;
border-image-source: none;
border-image-width: 1 1 1 1;
border-left-color-ltr-source: physical;
border-left-color-rtl-source: physical;
border-left-color-value: #B8B8B8;
border-left-style-ltr-source: physical;
border-left-style-rtl-source: physical;
border-left-style-value: solid;
border-left-width-ltr-source: physical;
border-left-width-rtl-source: physical;
border-left-width-value: 1px;
border-right-color-ltr-source: physical;
border-right-color-rtl-source: physical;
border-right-color-value: #B8B8B8;
border-right-style-ltr-source: physical;
border-right-style-rtl-source: physical;
border-right-style-value: solid;
border-right-width-ltr-source: physical;
border-right-width-rtl-source: physical;
border-right-width-value: 1px;
border-top-color: #B8B8B8;
border-top-left-radius: 5px;
border-top-right-radius: 5px;
border-top-style: solid;
border-top-width: 1px;
box-shadow: 0 2px 2px rgba(0, 0, 0, 0.1);
float: left;
width: 350px;
height:200px;
}
</style>
</head>
<body>
<div class="img-preview"></div>
</body>
</html>
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让div的四个角成弧形
原文：http://blog.csdn.net/ye1992/article/details/20559975
