GTK4: how to install needed fonts?

On my system inside container, fonts in GTK±4 apps are broken (A letters inside rectangles are displayed in place of each character). When I share /usr/share/fonts, /usr/share/font(s?)config and /usr/share/fonts-config directory, then everything worked.

Which fonts GTK±4 application use by default (for example: on buttons and labels)? What the package names?

I just installed xorg-x11-fonts . It now works.