css下拉菜单箭头

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Dropdown Arrow</title>
    <style>
        .dropdown {
            position: relative;
            display: inline-block;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
            z-index: 1;
        }

        .dropdown:hover .dropdown-content {
            display: block;
        }

        .dropdown::after {
            content: '';
            position: absolute;
            top: 50%;
            right: 10px;
            transform: translateY(-50%);
            border-left: 5px solid transparent;
            border-right: 5px solid transparent;
            border-top: 5px solid #000;
        }
    </style>
</head>
<body>
    <div class="dropdown">
        Dropdown
        <div class="dropdown-content">
            <a href="#">Link 1</a>
            <a href="#">Link 2</a>
            <a href="#">Link 3</a>
        </div>
    </div>
</body>
</html>

.dropdown::after {
    border-top-color: #000 !important;
}