Color, and thickness of the line horizontal line – in footer area

Running latest WP and theme ver on fleksjobbernetvaerket.dk I use the footer to display some contents. Two questions: 1) Can I change the background color for the whole footer area, or for each footer area (footer 1,2,3,4) ? 2) Can I change the thickness of the line horizontal line that seperate footer area fro mwhat is above? thanks Knud