1.整体效果
https://mmbiz.qpic.cn/sz_mmbiz_gif/EGZdlrTDJa6Pfop3IiakrZOtiaiaKniaxeH2Gs407DmkXPsMo8AFKdsYibYcpZiboc24Ulic2CicmyvHmnwCrib7MDe6Jvg/640?wx_fmt=gif&from=appmsg&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1
2.完整代码
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title> </title>
<link rel="stylesheet" type="text/css" href="6_16.css">
</head>
<body>
<section>
<!-- 背景颜色 -->
<div class="color"></div>
<div class="color"></div>
<div class="color"></div>
<div class="box">
<!-- 背景圆 -->
<div class="circle" style="--x:0"></div>
<div class="circle" style="--x:1"></div>
<div class="circle" style="--x:2"></div>
<div class="circle" style="--x:3"></div>
<div class="circle" style="--x:4"></div>
<!-- 登录框 -->
<div class="conMain">
<div class="form">
<h2>登录</h2>
<form>
<div class="inputBox">
<input type="text" placeholder="姓名">
</div>
<div class="inputBox">
<input type="password" placeholder="密码">
</div>
<div class="inputBox">
<input type="submit" value="登录">
</div>
<p class="forget">忘记密码?<a href="#">
点击这里
</a></p>
<p class="forget">没有账户?<a href="#">
注册
</a></p>
</form>
</div>
</div>
</div>
</section>
</body>
</html>
CSS
/* 清除浏览器默认边距，
使边框和内边距的值包含在元素的width和height内 */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
/* 使用flex布局，让内容垂直和水平居中 */
section {
/* 相对定位 */ position: relative;
overflow: hidden;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
/* linear-gradient() 函数用于创建一个表示两种或多种颜色线性渐变的图片 */ background: linear-gradient(to bottom, #f1f4f9, #dff1ff);
}
/* 背景颜色 */
section .color {
/* 绝对定位 */ position: absolute;
/* 使用filter(滤镜) 属性，给图像设置高斯模糊*/
filter: blur(200px);
}
/* :nth-child(n) 选择器匹配父元素中的第 n 个子元素 */
section .color:nth-child(1) {
top: -350px;
width: 600px;
height: 600px;
background: #ff359b;
}
section .color:nth-child(2) {
bottom: -150px;
left: 100px;
width: 500px;
height: 500px;
background: #fffd87;
}
section .color:nth-child(3) {
bottom: 50px;
right: 100px;
width: 500px;
height: 500px;
background: #00d2ff;
}
.box {
position: relative;
}
/* 背景圆样式 */
.box .circle {
position: absolute;
background: rgba(255, 255, 255, 0.1);
/* backdrop-filter属性为一个元素后面区域添加模糊效果 */ backdrop-filter: blur(5px);
box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
border: 1px solid rgba(255, 255, 255, 0.5);
border-right: 1px solid rgba(255, 255, 255, 0.2);
border-bottom: 1px solid rgba(255, 255, 255, 0.2);
border-radius: 50%;
/* 使用filter(滤镜) 属性，改变颜色。
hue-rotate(deg) 给图像应用色相旋转
calc() 函数用于动态计算长度值
var() 函数调用自定义的CSS属性值x*/
filter: hue-rotate(calc(var(--x) * 70deg));
/* 调用动画animate，需要10s完成动画，
linear表示动画从头到尾的速度是相同的，
infinite指定动画应该循环播放无限次*/
animation: animate 10s linear infinite;
/* 动态计算动画延迟几秒播放 */ animation-delay: calc(var(--x) * -1s);
}
/* 背景圆动画 */
@keyframes animate {
0%, 100%, {
transform: translateY(-50px);
}
50% {
transform: translateY(50px);
}
}
.box .circle:nth-child(1) {
top: -50px;
right: -60px;
width: 100px;
height: 100px;
}
.box .circle:nth-child(2) {
top: 150px;
left: -100px;
width: 120px;
height: 120px;
z-index: 2;
}
.box .circle:nth-child(3) {
bottom: 50px;
right: -60px;
width: 80px;
height: 80px;
z-index: 2;
}
.box .circle:nth-child(4) {
bottom: -80px;
left: 100px;
width: 60px;
height: 60px;
}
.box .circle:nth-child(5) {
top: -80px;
left: 140px;
width: 60px;
height: 60px;
}
/* 登录框样式 */
.conMain {
position: relative;
width: 400px;
min-height: 400px;
background: rgba(255, 255, 255, 0.1);
display: flex;
justify-content: center;
align-items: center;
backdrop-filter: blur(5px);
box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
border: 1px solid rgba(255, 255, 255, 0.5);
border-right: 1px solid rgba(255, 255, 255, 0.2);
border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}
.form {
position: relative;
width: 100%;
height: 100%;
padding: 50px;
}
/* 登录标题样式 */
.form h2 {
position: relative;
color: #fff;
font-size: 24px;
font-weight: 600;
letter-spacing: 5px;
margin-bottom: 30px;
cursor: pointer;
}
/* 登录标题的下划线样式 */
.form h2::before {
content: "";
position: absolute;
left: 0;
bottom: -10px;
width: 0px;
height: 3px;
background: #fff;
transition: 0.5s;
}
.form h2:hover:before {
width: 53px;
}
.form .inputBox {
width: 100%;
margin-top: 20px;
}
/* 输入框样式 */
.form .inputBox input {
width: 100%;
padding: 10px 20px;
background: rgba(255, 255, 255, 0.2);
outline: none;
border: none;
border-radius: 30px;
border: 1px solid rgba(255, 255, 255, 0.5);
border-right: 1px solid rgba(255, 255, 255, 0.2);
border-bottom: 1px solid rgba(255, 255, 255, 0.2);
font-size: 16px;
letter-spacing: 1px;
color: #fff;
box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}
.form .inputBox input::placeholder {
color: #fff;
}
/* 登录按钮样式 */
.form .inputBox input[type="submit"] {
background: #fff;
color: #666;
max-width: 100px;
margin-bottom: 20px;
font-weight: 600;
cursor: pointer;
}
.forget {
margin-top: 6px;
color: #fff;
letter-spacing: 1px;
}
.forget a {
color: #fff;
font-weight: 600;
text-decoration: none;
}