CSS实现垂直居中的几种方法
1. table-cell
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>Documenttitle>
<style>
.box{
width: 200px;
height: 200px;
background-color: #ff44ff;
display: table-cell;
vertical-align: middle;
text-align: center;
}
style>
head>
<body>
<div class="box">
<div>
<span>垂直居中span>
div>
div>
body>
html>
2. flex布局 (弹性布局)
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>Documenttitle>
<style>
.box{
width: 200px;
height: 200px;
background-color: #ff44ff;
display: flex;
justify-content: center;
align-items: center;
}
style>
head>
<body>
<div class="box">
<div>
<span>垂直居中span>
div>
div>
body>
html>
3. 使用position和transform
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>Documenttitle>
<style>
.box{
width: 200px;
height: 200px;
background-color: #ff44ff;
position: relative;
}
.box div span{
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
-webkit-transform: translate(-50%,-50%);
-ms-transform: translate(-50%,-50%);
}
style>
head>
<body>
<div class="box">
<div>
<span>垂直居中span>
div>
div>
body>
html>
4. margin: auto;
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>Documenttitle>
<style>
.box{
width: 200px;
height: 200px;
background-color: #ff44ff;
margin: auto;
}
style>
head>
<body>
<div class="box">
<div>
<span>垂直居中span>
div>
div>
body>
html>
5. 绝对定位
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>Documenttitle>
<style>
.box div span {
width: 50%;
height: 50%;
background: #f4f4f4;
overflow: auto;
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
style>
head>
<body>
<div class="box">
<div>
<span>垂直居中span>
div>
div>
body>
html>