三角箭头

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .arrow{
            border: 30px solid  transparent;
            border-top:30px solid #396bb3;
            display: inline-block;
        }
        .arrow:hover{
            border: 30px solid  transparent;
            border-bottom:30px solid #000000;
            margin-top: -15px;
        }
    </style>
</head>
<body>
    <div class="arrow">

    </div>
</body>
</html>
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原文地址：https://www.cnblogs.com/ezway/p/6949947.html