什么是BFC？

https://www.jianshu.com/p/0d713b32cd0d

https://www.cnblogs.com/mlw1814011067/p/10397999.html

https://www.jianshu.com/p/d94c6b679739

https://www.cnblogs.com/chengzp/p/cssbox.html

 

https://www.cnblogs.com/ranyonsue/p/9204986.html