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css3优惠券

<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8" />
    <title>实例: CSS3技巧：利用css3径向渐变做一张优惠券</title>
    <style>
        *{
            margin:0;padding: 0;
        }
        body{
            font-family: "Microsoft Yahei";
        }
        .demo{width:410px;margin:20px auto}
        .stamp {
            width: 387px;
            height: 140px;
            padding: 0 10px;
            margin-bottom: 50px;
            position: relative;
            overflow: hidden;
        }
        .stamp:before {
            content: '';
            position: absolute;
            top:0;
            bottom:0;
            left:10px;
            right:10px;
            z-index: -1;
        }
        .stamp:after {
            content: '';
            position: absolute;
            left: 10px;
            top: 10px;
            right: 10px;
            bottom: 10px;
            box-shadow: 0 0 20px 1px rgba(0, 0, 0, 0.5);
            z-index: -2;
        }

        .stamp i{
            position: absolute;
            left: 20%;
            top: 45px;
            height: 190px;
            width: 390px;
            background-color: rgba(255,255,255,.15);
            transform: rotate(-30deg);
        }
        .stamp .par{
            float: left;
            padding: 16px 15px;
            width: 220px;
            border-right:2px dashed rgba(255,255,255,.3);
            text-align: left;
        }
        .stamp .par p{color:#fff;font-size: 16px;
            line-height: 21px;}
        .stamp .par span{
            font-size: 50px;
            color:#fff;
            margin-right: 5px;
            line-height: 65px;
        }
        .stamp .par .sign{font-size: 34px;}
        .stamp .par sub{position: relative;top:-5px;
            color:rgba(255,255,255,.8);
        }
        .stamp .copy{
            display: inline-block;
            padding:21px 14px;
            width:100px;
            vertical-align: text-bottom;
            font-size: 30px;
            color:rgb(255,255,255);
            text-align: center;
            line-height: initial;
        }
        .stamp .copy p{font-size: 16px;margin-top: 15px;}
        .stamp01{
            background: #F39B00;
            background: radial-gradient(rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 5px, #F39B00 5px);
            background-size: 15px 15px;
            background-position: 9px 3px;
        }
        .stamp01:before{
            background-color:#F39B00;
        }
        .stamp02{
            background: #D24161;
            background: radial-gradient(transparent 0, transparent 5px, #D24161 5px);
            background-size: 15px 15px;
            background-position: 9px 3px;
        }
        .stamp02:before{
            background-color:#D24161;
        }
        .stamp03{
            background: #7EAB1E;
            background: radial-gradient(transparent 0, transparent 5px, #7EAB1E 5px);
            background-size: 15px 15px;
            background-position: 9px 3px;
        }
        .stamp03:before{
            background-color:#7EAB1E;
        }
        .stamp03 .copy{
            padding: 10px 6px 10px 12px;
            font-size: 24px;
        }
        .stamp03 .copy p{
            font-size: 14px;
            margin-top: 5px;
            margin-bottom: 8px;
        }
        .stamp03 .copy a{
            background-color:#fff;
            color:#333;
            font-size: 14px;
            text-decoration:none;
            padding:5px 10px;
            border-radius:3px;
            display: block;
        }
        .stamp04{
            width: 390px;
            background: #50ADD3;
            background: radial-gradient(rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 4px, #50ADD3 4px);
            background-size: 12px 8px;
            background-position: -5px 10px;
        }
        .stamp04:before{
            background-color:#50ADD3;
            left: 5px;
            right: 5px;
        }
        .stamp04 .copy{
            padding: 10px 6px 10px 12px;
            font-size: 24px;
        }
        .stamp04 .copy p{
            font-size: 14px;
            margin-top: 5px;
            margin-bottom: 8px;
        }
        .stamp04 .copy a{
            background-color:#fff;
            color:#333;
            font-size: 14px;
            text-decoration:none;
            padding:5px 10px;
            border-radius:3px;
            display: block;
        }
    </style>
</head>
<body>
<div class="demo">
    <div class="stamp stamp01">
        <div class="par"><p>XXXXXX折扣店</p><sub class="sign">￥</sub><span>50.00</span><sub>优惠券</sub><p>订单满100.00元</p></div>
        <div class="copy">副券<p>2015-08-13<br>2016-08-13</p></div>
        <i></i>
    </div>
    <div class="stamp stamp02">
        <div class="par"><p>XXXXXX折扣店</p><sub class="sign">￥</sub><span>50.00</span><sub>优惠券</sub><p>订单满100.00元</p></div>
        <div class="copy">副券<p>2015-08-13<br>2016-08-13</p></div>
        <i></i>
    </div>
    <div class="stamp stamp03">
        <div class="par"><p>XXXXXX折扣店</p><sub class="sign">￥</sub><span>50.00</span><sub>优惠券</sub><p>订单满100.00元</p></div>
        <div class="copy">副券<p>2015-08-13<br>2016-08-13</p><a href="#">立即使用</a></div>
        <i></i>
    </div>
    <div class="stamp stamp04">
        <div class="par"><p>XXXXXX折扣店</p><sub class="sign">￥</sub><span>50.00</span><sub>优惠券</sub><p>订单满100.00元</p></div>
        <div class="copy">副券<p>2015-08-13<br>2016-08-13</p><a href="#">立即使用</a></div>
        <i></i>
    </div>
</div>
</body>
</html>

实现优惠券花边效果的关键代码只有下边的三句

background: radial-gradient(rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 5px, #F39B00 5px);
background-size: 15px 15px;
background-position: 9px 3px;

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原文地址：https://www.cnblogs.com/dongxiaolei/p/7195933.html