18. change ubuntu.css in /usr/share/gnome-shell/theme/ directory to do it, open terminal and run this command-
"sudo cp /usr/share/gnome-shell/theme/ubuntu.css /usr/share/gnome-shell/theme/ubuntu.bak"
19. now copy download GDM theme's ubuntu.css file into /usr/share/gnome-shell/theme directory. to do this open terminal in the downloaded theme directory and run this command-
"sudo cp ubuntu.css /usr/share/gnome-shell/theme/ubuntu.css"
then run this command-
"cp SetAsWallpaper ~/.local/share/nautilus/s
آی-ویدئو