CSS 居中问题探讨_html/css_WEB-ITnose
前言
CSS居中一直是一个比较敏感的话题，为了以后开发的方便，楼主觉得确实需要总结一下了，总的来说，居中问题分为垂直居中和水平居中，实际上水平居中是很简单的，但垂直居中的方式和方法就千奇百怪了。
内联元素居中方案
水平居中设置：
-
行内元素设置 text-align:center；
-
Flex布局设置display:flex;justify-content:center;(灵活运用)
垂直居中设置：
-
父元素高度确定的单行文本（内联元素）设置 height = line-height；
-
父元素高度确定的多行文本（内联元素）a:插入 table （插入方法和水平居中一样），然后设置 vertical-align:middle；
b:先设置 display:table-cell 再设置 vertical-align:middle；
块级元素居中方案
水平居中设置：
-
定宽块状元素设置 左右 margin 值为 auto；
-
不定宽块状元素a:在元素外加入 table 标签（完整的，包括 table、tbody、tr、td），该元素写在 td 内，然后设置 margin 的值为 auto；
b:给该元素设置 displa:inine 方法；c:父元素设置 position:relative 和 left:50%，子元素设置 position:relative 和 left:50%；
垂直居中设置：
-
1.使用position:absolute（fixed）,设置left、top、margin-left、margin-top的属性;
.box{ position:absolute;/*或fixed*/ top:50%; left:50%; margin-top:-100px; margin-left:-200px;}-
2.利用position:fixed（absolute）属性，margin:auto这个必须不要忘记了;
.box{ position: absolute;或fixed top:0; right:0; bottom:0; left:0; margin: auto;}-
3.利用display:table-cell属性使内容垂直居中;
.box{display:table-cell;vertical-align:middle;text-align:center;width:120px;height:120px;background:purple;}-
4.使用css3的新属性transform:translate(x,y)属性;
.box{ position: absolute; transform: translate(50%,50%); -webkit-transform:translate(50%,50%); -moz-transform:translate(50%,50%); -ms-transform:translate(50%,50%);}-
5.最高大上的一种，使用:before元素;
.box{position:fixed;display:block;background:rgba(0,0,0,.5);}.box:before{content:'';display:inline-block;vertical-align:middle;height:100%;}.box.content{width:60px;height:60px;line-height:60px;color:red;-
6.Flex布局;
.box{ display: -webkit-box; display: -webkit-flex; display: -moz-box; display: -moz-flex; display: -ms-flexbox; display: flex; 水平居中 -webkit-box-align: center; -moz-box-align: center; -ms-flex-pack:center; -webkit-justify-content: center; -moz-justify-content: center; justify-content: center; 垂直居中 -webkit-box-pack: center; -moz-box-pack: center; -ms-flex-align:center; -webkit-align-items: center; -moz-align-items: center; align-items: center;}结语
楼主暂时掌握了这些居中方法，读者如果还有好方法或是觉得那个地方不对，欢迎评论，不吝感谢。
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