a dumb and simple edit of kde_onedark by Prayag2 with catppuccin colors
copy the folders in aurorae/themes/CatppuccinThin into your own ~/.local/share/aurorae/themes/ folder (or /usr/share/aurorae/themes/ for a system-wide installation) then go into System Settings > Appearance > Global Theme > Window Decorations then choose any of the CatppuccinThin- themes.