Regarding the display:flex effect, what is it mainly used for? _html/css_WEB-ITnose

Today I came into contact with a small game from Tencent. There is a question in it

The answer is to set dipslay:flex on the parent element; and set flex:1 on the second div
I would like to ask, what does this do? What is it?

Reply to discussion (solution)

No one has used it?

Very few people use it like this

Very few people use it like this

This is the flexible layout in css3

http://css-tricks.com/snippets/css/a-guide-to-flexbox/

?Layout method , you can get it after solving it
If you don’t understand the website yet, let’s take a look first

I haven’t used it before, I checked it online and I understand the purpose

This is the flexible layout in CSS3

I haven’t used it before, but I checked it online and understood its use.