The css3 flex layout is proportionally divided into four parts. why is there a blank on the right?

my code
https://codepen.io/zxq2233/pe.

each of the four boxes accounts for 25%, and the total width should be 100%. Why is there a blank on the right side? How to deal with it?

Mar.04,2021

https://stackoverflow.com/que.
has asked questions on stackoverflow. I hope you can help me



div...


clipboard.png
isn't that a little careless, brother?

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