How to increase size of icons in window title bar

[Mark Phillips]

I am running Ubuntu 18.04. Does anyone know how to increase the size of the
three icons in the window title bar (close, minimize, maximize) for each
window?

I used the gnome tweaks tool to increase the font size to a more
comfortable level, but those icons are minuscule. From my research there
may be a css setting in the gnome-theme, but I can't find anything that
might control the icon size in the window title bar.

I tried scaling the display in Settings, but 100% is too small without
increasing the font size, and 125% is too big. The display scaling does
increase the size of the icons, however.

I just notices that Chrome has the icons correctly sized for the font in
the window title bar. Weird.

Thanks!

Mark
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