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Invalid solution for text-align after float in CSS

Source: Internet
Author: User
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The Text-align:center attribute is used when the content is centered, but when the inner element is float, the text-align is invalidated.
We can only have other ways to achieve the goal of centering

The code is as follows Copy Code

<! DOCTYPE html>
<meta charset= "UTF-8" >
<title>float Best Practices in center </title>
<style type= "Text/css" >
*{margin:0; padding:0;}
Ul{list-style-type:none;}

container{width:600px padding:5px; border:2px solid #ddd; margin:30px auto; overflow:hidden; text-align:center;}
. container h2{font-size:14px; padding:10px 0;}

. sl-float-middle{position:relative; left:50%; float:left;}
sl-float-middle-cell{position:relative; float:left; right:50%; height:30px; line-height:30px; margin:0 5px; border:5px solid #f2f2f2;}
. Sl-float-middle-cell img{height:30px;}
</style>
<body>
<div class= "Container" >
<ul class= "Sl-float-middle" >
<li class= "Sl-float-middle-cell" > Width one </li>
<li class= "Sl-float-middle-cell" > Width 222 </li>
<li class= "Sl-float-middle-cell" > Three </li>
<li class= "Sl-float-middle-cell" ></li>
</ul>
</div>
</body>

This program is mainly to use the float:left+left:50% of the parent layer of UL, with the float:left+right:50% (left:-50%) of the son Layer Li to achieve the goal.
The HTML code is as follows:

The code is as follows Copy Code

<ul class= "Sl-float-middle" >
<li class= "Sl-float-middle-cell" > Width one </li>
<li class= "Sl-float-middle-cell" > Width 222 </li>
<li class= "Sl-float-middle-cell" > Three </li>
<li class= "Sl-float-middle-cell" ></li>
</ul>

The CSS code is as follows:

  code is as follows copy code

. sl-float-middl e{position:relative; left:50%; float:left;}
. sl-float-middle-cell{position:relative; float:left; right:50%;}

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