Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

/usr/share/themes/HighContrast/gtk-3.0/

//usr/share/themes/HighContrast/gtk-3.0/gtk.css

/* HighContrast is now part of GTK+ 3, this file is no longer used */