unit – How to resize the window icons (min, max, close), Ubuntu 18.04 Gnome

I have tried all the settings I could find on the internet and I still can not resize the window icons (close, min, max). All the rest, I was able to resize perfectly, but even the scale does not change them, as I wrote on the screen, the text gets big, but these icons stay small and no font size has the desired effect.

Any way to change the size of these icons ?, Thanks in advance!

Icons too small