登录页面动态波浪背景

效果图：

完整代码：

    
    
    
    
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Quicksand", sans-serif;
        }
        
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: #111;
            overflow: hidden;
        }
        
        .wave {
            position: relative;
            width: 100%;