Ultra change color/ layout

Hi,
I have just changed from the Sight theme to Ultra. The posts found helped me much already but i do not manage to change the following :
– the front and its size
– the background color (header and footer) – have unsuccessfully tried with the code inserted in a previous post.
– i have 2 black lines behind the slider and at the bottom of the page (above the bottom menu), surrounding 3 icons boxes, which remain too far from the slider (www.idaredsigns.com).
Many thanks in advance to the one who’s kind to help!