How to combine pixel perfect and flexbox?

Question

css

Hello.
Not so long ago, I began to master flexes, I immediately realized that it was a very convenient thing, but there were a couple of incomprehensible moments.
How to combine flex and pixel perfect? Is it possible to do without the "flex" attribute? That is, give the width as a percentage, and that's it. It is not clear how flex-grow and flex-shrink should be used if they require a pixel perfect.
In grids, I see that they use flex-basis and max-width with the same values, without any grow and shrink, is it customary to set the width like this?

Answer 1

What's the difference?
Apparently, you do not understand how to work with flex-box. Neither floats nor flex-box affect pixel perfect!
Only your ability to write css and html affects.
And the pixel perfect has outlived itself long ago, with the advent of adaptability!