themeWhich palette is painted, dark or light. Comfort only — this says nothing about which account you are on, and it is safe to change at any time. Dark is easier for a long sit; light reads as being at the desk. Whichever you pick, the environment keeps its own marks: the ribbon across the top of every page prints the account (paper is indigo and hatched, live is red), and live also wears the red edge stripe. Defaults to dark; the choice persists and follows you across tabs.