css三角

<!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>css三角做法</title>
    <style>
        .box {
             0;
            height: 0;
            border: 30px solid transparent;
            border-top-color: pink;
        }
    </style>
</head>

<body>
    <div class="box"></div>
</body>

</html>
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原文地址：https://www.cnblogs.com/icemiaomiao3/p/14582231.html