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Problem with horizontal and vertical centering of html

高洛峰Original: 2017-02-24 10:41:261382browse

I encountered a lot of centering problems recently, so I took some time to summarize them here so that they can be easily found in the future

1. Centered text

<p class="wrap">
      我在中间……
</p>
.. height+line-height+text-center（只能居中单行）
.wrap{
    width:px; 
    height:px;
    border:px solid red; 
    text-align: center;
    line-height: px;
}

ps:text-align:center just centers the inline element below the element
1.2display:table-cell (Multi-line fixed height centered)

.wrap{
    width:px; 
    height:px;
    border:px solid red; 
    text-align: center; 
    display:table-cell; 
    vertical-align: middle;
}

display:table-cell：ie67不管用,最好配合display:table;一起用

ie67 next: (I won’t use it in the future, but I’ll put it here)
Method one: (The height of the em tag is the same as the height of the parent, so centering span and em is equivalent to centering span on the parent)

<p class="wrap">
   <span>
       我在中间…… 我在中间…… 我在中间…… 我在中间……
   </span>
   <em></em>
</p>
 .wrap{
     width:px; 
     height:px;
     border:px solid red; 
     text-align: center;
 }
 .wrap span{
     vertical-align: middle;
     display:inline-block; 
    width:px;
}
.wrap em{
    height:%;
    vertical-align: middle; 
    display:inline-block;
}

Method two: (By adding an absolutely positioned parent tag to the child element, and then matching the relative positioning of the child element to center it horizontally and vertically)

<p class="wrap">
    <span class="span">
       <span class="span">我在中间…… 我在中间…… 我在中间…… 我在中间……</span>
    </span>
</p>
 .wrap{
     width:px; 
     height:px;
     border:px solid red;
     display:table;
     position:relative; 
     overflow: hidden;
 }
 .wrap .span{
    display:table-cell; 
    vertical-align: middle; 
    text-align: center;
    *position:absolute;
    top:%;
    left:%;
}
.wrap .span{
    *position:relative;
    top:-%;
    left:-%;
}

1.3padding (inner padding, needless to say)

.wrap{
    width:px;
    border:px solid red;
    padding:px ;
}

2. Centered element

<p class="wrap">
    <span></span>
</p>

2.1position:absolute+margin negative value (you must have width and height to calculate margin)

 .wrap{
     width:px; 
     height:px;
     position:absolute; 
     top:%; 
     left:%; 
     margin-top:-px; 
     margin-left:-px;
     border:px solid red;
}
.wrap span{ 
    width:px; 
    height:px; 
    background:red;
    position: absolute; 
    top:%; 
    left:%; 
    margin-top:-px; 
    margin-left:-px;
}

ps: CSS implements horizontal centering and vertical centering of p

<!DOCTYPE html>  
<html>  
<head>  
<meta charset="utf-8" />  
<title>上下垂直居中 在线演示 pCSS5</title>  
<style>  
#main {  
   position: absolute;  
   width:400px;  
   height:200px;  
   left:50%;  
   top:50%;  
   margin-left:-200px;  
   margin-top:-100px;  
   border:1px solid #00F  
}  
/*css注释：为了方便截图，对CSS代码进行换行*/  
</style>  
</head>  
<body>  
   <p id="main">p水平居中和上下垂直居中<a href="http://www.pcss5.com/">pCSS5</a></p>  
</body>  
</html>

Introduction to the principle of horizontal and vertical centering
Absolute is used here Position position: absolute, use left and top to set the object distance to the top and left to 50%, but if you set it to 50%, the box will not actually be centered, so you set margin-left:-200px; margin-top:-100px ;, a trick here is that the value of margin-left is half the width, and the value of margin-top is also half the height of the object, and is set to negative at the same time, thus achieving horizontal and vertical centering.

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