# NixOS FontSize Bug NixOS/Wayland can cause a bug where the `font-size` css property doesn't affect the rendered page. To fix this add the following to your devShell. ```shell shellHook = with pkgs; '' export XDG_DATA_DIRS=${gsettings-desktop-schemas}/share/gsettings-schemas/${gsettings-desktop-schemas.name}:${gtk3}/share/gsettings-schemas/${gtk3.name}:$XDG_DATA_DIRS; export GIO_MODULE_DIR="${pkgs.glib-networking}/lib/gio/modules/"; ''; ```