实现效果:

代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<style>
.box1 {
width: 300px;
height: 300px;
background-color: rgb(209, 233, 209);
}
.box2 {
width: 150px;
height: 150px;
background-color: rgb(245, 196, 169);
position: relative;
margin: 0 auto;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
/* 文字居中 */
text-align: center;
line-height: 145px;
}
</style>
<body>
<div class="box1">
<div class="box2">居中了</div>
</div>
</body>
</html>
2、在屏幕居中
.login {
width: 200px;
height: 500px;
position: fixed;
bottom: 0;
left: 0;
right: 0;
top: 0;
z-index: 901;
color: rgb(142, 180, 252);
text-align: center;
font-size: 14px;
background-color: white;
margin: auto;
}版权声明:本文为dxnn520原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接和本声明。