tapeta

1. wallpaper
   Skinuli smo staru tapetu i okrečili zidove. — We stripped the old wallpaper and painted the walls.
   U dečjoj sobi su tapete sa zvezdicama. — The kids' room has wallpaper with little stars.
2. colloq. (on a screen) wallpaper; background image
   Stavio sam sliku mora za tapetu na telefonu. — I set a photo of the sea as my phone wallpaper.

Wallpaper in general is usually plural, tapete; the singular tapeta usually refers to one strip, panel or pattern of wallpaper: jedna tapeta se odlepila.