Delete black box showing behind slider

Good morning. I thought I needed to start this as a new threat. I just viewed my site and I see a big black box behind my slider. Also, the slider does not seem to fit properly. Is there anyway to delete the box behind the slider and what measurements should I use so that the slider will fit on screen? Any help is much appreciated. Extremely new to all of this. My first creation….thanks in advance.

I am using Snaps theme and Revolution Slider.

https://www.piixdot.com