css 圆，半圆，三角，梯形

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style type="text/css">
        pre {
            padding: 10px;
            border: 1px solid #cccccc;
            background-color: #f1f1f1;
        }

        .yuan {
            width: 100px;
            height: 100px;
            border-radius: 50px;
            background-color: red;
        }

        .yuan1 {
            width: 0;
            height: 0;
            border-top: 40px solid transparent;
            border-right: 40px solid red;
            border-left: 40px solid red;
            border-bottom: 40px solid red;
            border-radius: 40px;
        }

        .sanjiao {
            width: 0;
            height: 0;
            border-right: 40px solid transparent;
            border-left: 40px solid transparent;
            border-bottom: 40px solid #000;
        }

        .class1 {
            width: 100px;
            height: 0px;
            border-bottom: 50px solid #000;
            border-bottom-left-radius: 50px;
            border-bottom-right-radius: 50px;
        }

        .class2 {
            width: 50px;
            height: 0px;
            border-bottom: 50px solid red;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
        }
    </style>
</head>

<body>
    <div class="yuan"></div>
    <pre>
        .yuan {
            width: 100px;
            height: 100px;
            border-radius: 50px;
            background-color: red;
        }
    </pre>
    <br>
    <div class="sanjiao"></div>
    <pre>
        .sanjiao {
            width: 0;
            height: 0;
            border-right: 40px solid transparent;
            border-left: 40px solid transparent;
            border-bottom: 40px solid #000;
        }
    </pre>
    <br>
    <div class="yuan1"></div>
    <pre>
        .yuan1 {
            width: 0;
            height: 0;
            border-top: 40px solid transparent;
            border-right: 40px solid red;
            border-left: 40px solid red;
            border-bottom: 40px solid red;
            border-radius: 40px;
        }
    </pre>
    <br>
    <div class="class1"></div>
    <pre>
        .class1 {
            width: 100px;
            height: 0px;
            border-bottom: 50px solid #000;
            border-bottom-left-radius: 50px;
            border-bottom-right-radius: 50px;
        }
    </pre>
    <br>
    <div class="class2"></div>
    <pre>
        .class2 {
            width: 50px;
            height: 0px;
            border-bottom: 50px solid red;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
        }
    </pre>
</body>

</html>
css 圆，半圆，三角，梯形

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