It's only an edge case until you handle white-labeling services for other companies, at which point you immediately need a way to conveniently tweak the styling

It's only an edge case until you handle white-labeling services for other companies, at which point you immediately need a way to conveniently tweak the styling of everything in your web app per white-label client, preferably in a database-supplied way so that your support team doesn't have to handle every adjustment said client wants to make.