css3边角旋转

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
    * {
        margin: 0;
        padding: 0;
    }
    
    .box {
        width: 500px;
        height: 500px;
        background: #ddd;
        margin: 20px auto;
        position: relative;
    }
    
    .box .icon {
        display: block;
        height: 30px;
        line-height: 30px;
        color: #fff;
        position: absolute;
        right: -35px;
        top: 35px;
        transform: rotate(45deg);
        -ms-transform: rotate(45deg);
        -moz-transform: rotate(45deg);
        -webkit-transform: rotate(45deg);
        -o-transform: rotate(45deg);
    }
    
    .box .icon span {
        display: inline-block;
        float: left;
    }
    
    .box .icon span.left {
        width: 0;
        height: 0;
        border-top: 30px solid transparent;
        border-right: 30px solid #db0202;
    }
    
    .box .icon span.right {
        width: 0;
        height: 0;
        border-top: 30px solid transparent;
        border-left: 30px solid #db0202;
    }
    
    .box .icon span.center {
        height: 30px;
        line-height: 30px;
        color: #fff;
        background-color: #db0202;
    }
    </style>
</head>

<body>
    <div class="box">
        <div class="icon"><span class="left"></span><span class="center">专营高品质茶器</span><span class="right"></span></div>
    </div>
</body>

</html>
效果图：