Having a new kitchen fitted. The units are cashmere in color with a darkish wood affect colored work top. Not sure what color to choose for the glass splash back. The fitter said to have white. I'm not sure. Haven't decided what color to do the walls yet as it is difficult to visualize before fitting. The hob is black and the splash back is only going behind the hob. Wondering whether to have black to match. Should it be the same width as the hob 60cm or should it be slightly wider. What would others suggest.