css雪花特效

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Snow Effect</title>
    <style>
        body {
            background: #000;
            overflow: hidden;
        }
        .snowflake {
            position: absolute;
            top: -10px;
            width: 10px;
            height: 10px;
            background: white;
            border-radius: 50%;
            animation: fall 5s linear infinite;
        }
        @keyframes fall {
            to {
                transform: translateY(100vh);
            }
        }
    </style>
</head>
<body>
    <div class="snowflake" style="left: 10%;"></div>
    <div class="snowflake" style="left: 30%;"></div>
    <div class="snowflake" style="left: 50%;"></div>
    <div class="snowflake" style="left: 70%;"></div>
    <div class="snowflake" style="left: 90%;"></div>
</body>
</html>