浅谈CSS居中问题（水平居中、垂直居中、水平垂直居中）

Myth丶恋晨 2023-06-13 09:37 21阅读 0赞

### 浅谈居中问题 ###

*   *  概述
     *  行内元素居中
     *   *  水平居中
         *   *  方法一：父元素设置text-align: center;即可
         *  垂直居中
         *   *  方法一：父元素设置line-height即可
             *  方法二：父元素设置padding-top、padding-bottom
         *  水平垂直居中
         *   *  方法：设置text-align:center; line-height即可
     *  块元素居中
     *   *  水平居中
         *   *  方法一：margin: 0 auto;
             *  方法二：改变块元素为行内块元素 display: inline-block;
             *  方法三：定位 position
             *  方法四：flex布局
             *  方法五：box布局
         *  垂直居中
         *  水平垂直居中

## 概述 ##

> 谈到居中，想必在工作中经常碰到该问题。水平居中，垂直居中，已知元素宽高，未知元素宽高等情况。

> 居中元素主要有以下两种  
> 1. 行内元素居中  
> 2. 块元素居中

> 居中情况主要有以下两种  
> 1. 已知元素宽高居中  
> 2. 未知元素宽高居中

## 行内元素居中 ##

### 水平居中 ###

#### 方法一：父元素设置text-align: center;即可 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 1]

### 垂直居中 ###

#### 方法一：父元素设置line-height即可 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 3]

#### 方法二：父元素设置padding-top、padding-bottom ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 5]

### 水平垂直居中 ###

#### 方法：设置text-align:center; line-height即可 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 7]

## 块元素居中 ##

### 水平居中 ###

#### 方法一：margin: 0 auto; ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 8]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 9]

#### 方法二：改变块元素为行内块元素 display: inline-block; ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 10]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 11]

#### 方法三：定位 position ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 12]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 13]

#### 方法四：flex布局 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 14]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 15]

#### 方法五：box布局 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 16]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 17]

### 垂直居中 ###

### 水平垂直居中 ###

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center]: https://img-blog.csdnimg.cn/1062c20c4b5f403d90dd2676f48b4fb9.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 1]: https://img-blog.csdnimg.cn/70fb90d280824402ac7c484912351c1b.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 2]: https://img-blog.csdnimg.cn/3fe2f8ceae754b458ca78a193a1ac41b.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 3]: https://img-blog.csdnimg.cn/215f87cd779743939623c58d97aadcea.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 4]: https://img-blog.csdnimg.cn/5fce02e203b7409ca764a83eac488149.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 5]: https://img-blog.csdnimg.cn/603ebf0aac8540a9bbe4852ffa649124.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 6]: https://img-blog.csdnimg.cn/4c44742abef141c9afa0053e8107a465.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 7]: https://img-blog.csdnimg.cn/17e93608b1714ca6aa4a083f09a43984.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 8]: https://img-blog.csdnimg.cn/1799201999b1407696bcd528d942fdea.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 9]: https://img-blog.csdnimg.cn/5f0687fd9d12408eb0704d1042ed7b39.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 10]: https://img-blog.csdnimg.cn/7d7672fb2ad6486199f50ffce63ec0b3.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 11]: https://img-blog.csdnimg.cn/7083ec5e62e841799a68849a7ae09f2b.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 12]: https://img-blog.csdnimg.cn/935539ba460843d8b25b179f5af3b374.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 13]: https://img-blog.csdnimg.cn/a788200338cc46eca286947947e6c7bb.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 14]: https://img-blog.csdnimg.cn/ea577f2e3cbf423ba075298c24818bf5.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 15]: https://img-blog.csdnimg.cn/f5e38f4a55284ca68228893fe0527fdb.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 16]: https://img-blog.csdnimg.cn/a49b95e675474f03a65ecbe005398623.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp_size_16_color_FFFFFF_t_70_pic_center 17]: https://img-blog.csdnimg.cn/320b792d48c14fd3b4475cabc38d4237.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYW5nX2Z1bGFp,size_16,color_FFFFFF,t_70#pic_center