That's a css style in vanilla.
.fade-out {
position: absolute;
top: 190px;
left: 0;
width: 100%;
margin: 0;
padding: 30px 0;
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, transparent),color-stop(1, white));
background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 0), white);
background-image: -moz-linear-gradient(top, rgba(255, 255, 255, 0), white);
background-image: -ms-linear-gradient(top, transparent, white);
background-image: -o-linear-gradient(top, transparent, white);
}
Just change the white to your desired background color. In your case I think it is #2b2b2b
I think.
.lights-out .fade-out {
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, transparent),color-stop(1, #2b2b2b));
background-image: -webkit-linear-gradient(top, rgba(43, 43, 43, 0), #2b2b2b);
background-image: -moz-linear-gradient(top, rgba(43, 43, 43, 0), #2b2b2b);
background-image: -ms-linear-gradient(top, transparent, #2b2b2b);
background-image: -o-linear-gradient(top, transparent, #2b2b2b);
}
Should work, adjust if you want a different color.