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CSS Center alignment Ultimate Guide  
This article is published in my official account ： Front end new world
Welcome to your attention

This article will discuss the methods that can be used to center aligned elements 6 Kind of CSS technology （ Sort by best practices ）, And the most suitable scenario for each technology . here , Centering refers to placing an element at the horizontal and vertical center of its parent element .

.center Class represents the element to be centered

.parent Class represents its parent element .

1. Use transformation （Transform）
When to use ：

When the width and height of the element are unknown ;
There are multiple child elements in the card pop-up box , One of the focus elements is in the center .
The idea is to use absolute positioning ——top and left 50％, Then apply the negative transformation .top and left The values used in are resolved according to the size of the parent element , and translate The value in the method is parsed according to the size of the element itself .

.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
2. Use Flex
When to use ：

When there is one or more elements to center ;
When the child element is dynamic and the size is unknown ;
When a line item needs to be centered like a footer .
The idea is to make the parent container flexbox And use flex Property centers the element horizontally and vertically , As shown below .

.parent {
    display: flex;
    justify-content: center; 
    align-items: center;
}

windows nginx Static resources To configure

https://www.jianshu.com/p/e798adcdea8c

http://localhost/imgs/124.jpg

# Refine Configure relevant static resource parameters , Optimize access to static resource files
location ~ .*\.(gif|jpg|jpeg|png)$ {
expires 24h;
root  G:/nginx-1.21.6/nginx-1.21.6/html/imgs/;# Specify the image storage path
proxy_store on;
proxy_temp_path  G:/nginx-1.21.6/nginx-1.21.6/html/imgs/;# Image access path
proxy_redirect off;
proxy_set_header Host 127.0.0.1;
client_max_body_size 10m;
client_body_buffer_size 1280k;
proxy_connect_timeout 900;
proxy_send_timeout 900;
proxy_read_timeout 900;
proxy_buffer_size 40k;
proxy_buffers 40 320k;
proxy_busy_buffers_size 640k;
proxy_temp_file_write_size 640k;
if ( !-e $request_filename)
{
proxy_pass http://127.0.0.1;# Default 80 port
}

}

https://www.cnblogs.com/you-men/p/12827513.html

https://developer.aliyun.com/article/793181

https://blog.csdn.net/weixin_34246551/article/details/91547490?spm=1001.2101.3001.6650.14&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-14.pc_relevant_antiscanv2&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-14.pc_relevant_antiscanv2&utm_relevant_index=15

LuManager CDN

TaoBao ：tengine
http://tengine.taobao.org/book/chapter_02.html#id1

https://www.nginx.cn/doc/

https://www.cnblogs.com/LRAB/p/13600907.html
windows nginx Load balancing
C:\Users\cmputer>g:

G:\>cd G:\nginx-1.21.6\nginx-1.21.6

G:\nginx-1.21.6\nginx-1.21.6>start nginx

G:\nginx-1.21.6\nginx-1.21.6>

nginx Default 80 port
Check the results http://localhost/

   upstream my_web{
        server 127.0.0.1:8011 weight=1;
        server 127.0.0.1:8012 weight=2;
    }
    server {
        listen       8010;
        server_name  my_web;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
            proxy_pass http://my_web;
        }

G:\nginx-1.21.6\nginx-1.21.6>nginx -s reload

Algorithm      explain
Weighted polling     weight The bigger the value is. , The more likely you are to visit
ip_hash     Per request by access IP Of hash Result distribution , From the same IP Your request will access a fixed server
least_conn     Minimum number of links , Which machine has less connections is allocated to that machine
url_hash     According to the URL Of hash Allocation request , Every url Directed to the same server
hash Key values     hash Self defined key

https://www.w3cschool.cn/nginxsysc/nginxsysc-cache.html

https://www.cnblogs.com/qdhxhz/p/8910174.html

https://www.cnblogs.com/fjytzh/archive/2011/05/27/2060079.html
https://www.cnblogs.com/bruce1992/p/14050236.html niu
https://www.cnblogs.com/handongyu/p/6410405.html
http://www.pinpaidadao.com/aliyun/?tags/54254
https://www.cnblogs.com/zhangchaocoming/p/15472884.html
https://www.cnblogs.com/itzgr/p/13321980.html
https://www.cnblogs.com/itzgr/p/13295013.html
https://www.cnblogs.com/zeq912/p/10013147.html
https://www.cnblogs.com/mrhelloworld/p/nacos-config.html
https://www.runoob.com/w3cnote/nginx-setup-intro.html
https://www.cnblogs.com/knowledgesea/p/5175711.html
Nginx Of proxy_store and proxy_cache What's the difference? ？
https://www.yisu.com/zixun/231959.html
https://support.huaweicloud.com/topic/1240666-5-n
https://www.cnblogs.com/Mrchengs/p/11940240.html
https://www.laobuluo.com/1119.html
https://www.cnblogs.com/kevingrace/p/5892169.html
https://www.cnblogs.com/leefreeman/p/3998757.html
https://www.cnblogs.com/three-fighter/p/14757813.html
https://www.cnblogs.com/smallSevens/p/7554380.html
https://www.cnblogs.com/wangtao_20/p/4582701.html
https://www.cnblogs.com/mindwind/p/5339657.html
https://www.cnblogs.com/mrhelloworld/p/nginx.html
https://www.cnblogs.com/mrhelloworld/p/redis-architecture.html
https://www.cnblogs.com/sheng-jie/p/Deploy-ASP-NET-CORE-WITH-REVERSE-PROXY.html
https://www.hellorf.com/
https://www.cnblogs.com/daizhj/archive/2010/06/24/1667422.html
https://www.kemaowang.org.cn/
https://www.yshuq.com/?p=12606
https://mirrors.tuna.tsinghua.edu.cn/apache/
https://blog.51cto.com/u_15015155/2554672
https://baijiahao.baidu.com/s?id=1680650957579563541&wfr=spider&for=pc
https://github.com/alibaba/nacos
https://github.com/alibaba/spring-cloud-alibaba
https://github.com/alibaba/Sentinel
https://icomoon.io/#icons
https://github.com/alibaba/lowcode-engine
https://github.com/davideuler/architecture.taobao-alibaba
https://github.com/alibaba/arthas
https://github.com/alibaba/p3c
https://github.com/wuyouzhuguli/SpringAll