效果图：
完整代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>登录页面-波浪加载动画</title>
<style>
* {
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%;
