add gradient to color section instead of color overlay

Hi guys, i’m trying to add a bottom gradient to the first color section on this page instead of just an overlay over the whole image. I added this to css but doesn’t look like it’s working:

.av-section-color-overlay {
	background: rgb(0,0,0);
	background: linear-gradient(5deg, rgba(0,0,0,0.6825105042016807) 0%, rgba(0,0,0,0.43601190476190477) 95%);
}

Can you help me with this? Thank you :)