边框制作三角形

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            margin: 100px auto;
            width: 0;
            height: 0;
            /* 透明色 */
            border: 20px solid transparent;
            /*想指向哪边,只需修改边框相对方向*/
            border-top-color: red;
        }
    </style>
</head>

<body>
    <div></div>
</body>

</html>

屏幕截图 2022-04-20 150215.png