Summary of CSS vertical centering
Foreword: This is the author’s own understanding and organization after studying. If there are any errors or questions, please correct me and I will continue to update!
Vertical centering is used in many places and there are many solutions.
Known element width You can use position positioning + negative margin method
Absolute positioning + 0px in all 4 directions + margin: auto You can achieve horizontal centering based on the parent container; if you only need vertical centering, you can delete left and right, and there are many methods of horizontal centering.
Absolute positioning + left 50% + margin left: a negative value of half the width It can be horizontally centered, the right can also be
absolute positioning + top 50% + margin top: a negative value of half the height can be vertically centered, and the bottom can also be
<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.wrapper{
width: 500px;
height: 500px;
background: #f90;
left: 0;
right: 0;
top: 0;
bottom: 0;
position: absolute;
margin: auto;
/*绝对定位 + 4个方向全部0px + margin：auto 可以做到基于父容器水平垂居中*/
/*如果只需要垂直居中，那可以把left和right删掉，并且水平居中的方法也很多*/
}
.content{
width: 100px;
height: 200px;
background: #0f8;
position: absolute;
/*position: absolute基于第一个不是position：static的父级元素定位*/
left: 50%;
top: 50%;
margin-left: -50px;
margin-top: -100px;
/*绝对定位 + 左50% + margin左：宽度一半的负值 可以做到水平居中 右也可以*/
/*绝对定位 + 上50% + margin上：高度一半的负值 可以做到垂直居中 底部也可以*/
}
</style>
</head>
<body>
<p class="wrapper">
<span class="content"></span>
</p>
</body></html>View Code
Unknown element width You can use position positioning + transform:translate (x, y) to move
Absolute positioning + upper 50% + lower 50% + transform:translate (-50%, -50%) to achieve vertical centering
<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.wrapper{
width: 500px;
height: 500px;
background: #f90;
left: 0;
right: 0;
top: 0;
bottom: 0;
position: absolute;
margin: auto;
/*绝对定位 + 4个方向全部0px + margin：auto 可以做到基于父容器水平垂居中*/
/*如果只需要垂直居中，那可以把left和right删掉，并且水平居中的方法也很多*/
}
.content{
width: 100px;
height: 200px;
background: #0f8;
position: absolute;
/*position: absolute基于第一个不是position：static的父级元素定位*/
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
/*transform变化、使...变形、转换；transform属性应用于元素的2D或3D转换。这个属性允许你将元素移动，旋转，缩放，倾斜*/
/*translate平移,是transform的属性值的一部分*/
/*transition过渡、转变；可多个样式的变换效果*/
}
</style>
</head>
<body>
<p class="wrapper">
<span class="content"></span>
</p>
</body></html>##The img image in p is vertically centered :
You can use vertical-align:middle, but this attribute only works on elements of the inline-block type (inline also has an impact). I have to continue to learn about vertical-align. I welcome your corrections.
Method 1: Image vertical-align:middle + the height of the parent element is consistent with the line-height
<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
padding: 0;margin: 0;
}
.wrapper{
height: 300px;
line-height: 300px;
width: 300px;
margin:100px auto;
background: #f90;
text-align: center;
}
.wrapper img{
width: 150px;
vertical-align: middle;
}
</style>
</head>
<body>
<p class="wrapper">
<img src="/static/imghw/default1.png" data-src="images/1.jpg" class="lazy" alt="美女" title="美女"/>
</p>
</body></html>
View Code
Method 2: Parent element settings display: table-cell and vertical-align<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
padding: 0;margin: 0;
}
.wrapper{
width: 300px;
height: 300px;
background: #f90;
text-align: center;
vertical-align: middle;
display: table-cell;
}
.wrapper img{
width: 150px;
}
</style>
</head>
<body>
<p class="wrapper">
<img src="/static/imghw/default1.png" data-src="images/1.jpg" class="lazy" alt="美女" title="美女"/>
</p>
</body></html>
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