preload = /etc/nixos/config/wallpaper/images_dark/1920x1080.png
preload = /etc/nixos/config/wallpaper/images_dark/1920x1200.png
preload = /etc/nixos/config/wallpaper/images_dark/1080x1920.png

wallpaper = HDMI-A-1,/etc/nixos/config/wallpaper/images_dark/1920x1200.png
wallpaper = DP-1,/etc/nixos/config/wallpaper/images_dark/1080x1920.png
wallpaper = ,/etc/nixos/config/wallpaper/images_dark/1920x1080.png