CSS has two functions for clearing floats:

(1) You can surround elements to "visually" wrap floating elements

(2) Other elements under clearing will return to the default layout.

Note:

If there is floating, there must be clearing.

If the surrounding element has a specified height, then the clearing function does not need to be used.

      
  
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互联网是20世纪最伟大的发明，它正在将人类“一网打尽”，人们在不知不觉中已经融入了互联网生态，互联网让世界变成了“鸡犬之声相闻”的地球村。
  

Note: You can try to delete the statement that clears floats and see if there are any changes in the output