We have a couple of variables that can be used in the CSS sheet to call some already defined styles. If you use these variables, the solution will use the style that you defined on the front-end of your solution.
Font
var(--common-font, 'Some font name', sans serif);
Floormap
var(--floormap);
Primary h1 color
var(--h1-primary);
Button color
var(--btn-clr);
Button text color
var(--btn-txt-clr);