【css】图片垂直水平居中

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一、已知宽高的图片实现垂直水平居中

1.借助margin-top负边距实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>在已知图片高度的情况下借助margin-top负边距实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
position:relative;
width:500px;
height:500px;
text-align:center;
border:1px solid #e64c65;
}
img{
position:absolute;
top:50%;
height:88px;
left:0;
right:0;
margin:auto;
margin-top:-44px; }
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

2.借助额外的块级元素实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>在已知图片高度的情况下借助额外的块级元素实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
width:500px;
height:500px;
text-align:center;
border:1px solid #e64c65;
}
.temp{
height:50%;
margin-bottom:-44px;
}
img{
height:88px;
}
</style>
</head>
<body>
<div class="wrap">
<div class="temp"></div>
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

二、未知宽高的图片实现垂直水平居中

1.利用line-height 和 vertical-align:middle实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>利用line-height 和 vertical-align:middle实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
width:500px;
height:500px;
text-align: center;
line-height:500px;
border:1px solid #e64c65;
margin:100px auto; }
img{
vertical-align: middle;
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

2.借助高度100%的一个标签，原理vertical-align属性的特性实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>借助高度100%的一个标签，原理vertical-align属性的特性实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
width:500px;
height:500px;
text-align: center;
border:1px solid #e64c65;
}
img{
vertical-align: middle;
}
span{
display: inline-block;
height:100%;
vertical-align: middle;
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
<span></span>
</div>
</body>
</html>

3.利用after伪类实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>利用after伪类实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
width:500px;
height:500px;
text-align:center;
border:1px solid #e64c65;
}
.wrap::after{
display:inline-block;
content:'';
height:100%;
vertical-align: middle;
}
img{
vertical-align: middle;
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

4.利用table-cell实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>利用table-cell实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
display:table-cell;
width:500px;
height:500px;
font-size:0;
vertical-align: middle;
text-align: center;
border:1px solid #e64c65;
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

5.利用flex弹性布局实现垂直居中实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>利用flex弹性布局实现垂直居中实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
width:500px;
height:500px;
display: flex;
justify-content: center;
align-items: center;
border:1px solid #e64c65;
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

6.利用绝对定位实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>未知图片高度的情况下借助绝对定位实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
position:relative;
width:500px;
height:500px;
border:1px solid #e64c65;
}
img{
position:absolute;
top:0;
; bottom:0;
left:0;
right:0;
margin:auto;
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>

7.利用绝对定位+transform实现垂直居中

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>未知图片高度的情况下借助绝对定位+transform实现垂直居中</title>
<style type="text/css">
*{
margin:0;
padding:0;
}
html,body{
width:100%;
height:100%;
}
.wrap{
position:relative;
width:500px;
height:500px;
border:1px solid #e64c65;
}
img{
left: 50%;
top: 50%;
position: absolute;
-webkit-transform: translate3D(-50%,-50%,0);
-ms-transform: translate3D(-50%,-50%,0);
-moz-transform: translate3D(-50%,-50%,0);
-o-transform: translate3D(-50%,-50%,0);
transform: translate3D(-50%,-50%,0);
}
</style>
</head>
<body>
<div class="wrap">
<img src="girl.jpg" alt=""/>
</div>
</body>
</html>