使用div的border来实现三角和圆角图形

具体看代码

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #circle {
            /*  50px; */
            /* height: 50px; */
            width: 0;
            height: 0;
            border-style: solid;
            border-width: 0 25px 50px 25px;
            border-color: transparent transparent #ff00cc transparent;
        }

        .test {
            width: 0px;
            height: 0px;
            border-width: 30px;
            border-style: solid;
            /* border-color: red blue lightpink green; */
            border-color: transparent transparent red transparent;
            /* background-color: lightgray */
        }

        .box {
            width: 500px;
        }

        .top {
            border-bottom: 3px solid #cc0000;
            border-top-color: #cc0000;
            border-left: 3px dotted transparent;
            border-right: 3px dotted transparent;
        }

        .center {
            padding: 10px 20px;
            color: white;
            font-size: 14px;
            background: #cc0000;
        }

        .bot {
            border-top: 3px solid #cc0000;
            border-bottom-color: #cc0000;
            border-left: 3px dotted transparent;
            border-right: 3px dotted transparent;
        }
    </style>
</head>

<body>
    <div id="circle">

    </div>
    <br>
    <div class="test">

    </div>

    <br>
    <div class="box">
        <div class="top"></div>
        <div class="center">粉短剑腮红您囧来款看俩次</div>
        <div class="bot"></div>
    </div>
</body>

</html>

来自:http://www.zhangxinxu.com/wordpress/2010/05/css-border%E4%B8%89%E8%A7%92%E3%80%81%E5%9C%86%E8%A7%92%E5%9B%BE%E5%BD%A2%E7%94%9F%E6%88%90%E6%8A%80%E6%9C%AF%E7%AE%80%E4%BB%8B/

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原文地址：https://www.cnblogs.com/lxk0301/p/7372201.html