Evolve theme slider background

Love Evolve Theme! Having trouble with the bootstrap slider. Vertical gray bars are showing at the sides of the slider no matter what size I make the slider images (they are 1600px x 600px). Layout is set to full width and background for header and slideshow areas is set to white.

I have researched on here and followed a few suggestions from others with similar problems, but no matter what I try, I still have grey bars at the sides of the slider