How to change product card background / collection background to black

Store Design
,
1

Hi I need to change my collection / product card background to black as it is white please see attached images. ty.

2

This is Richard from PageFly - Shopify Page Builder App, I’d like to suggest this idea:
Online Store ->Theme ->Edit code
Assets ->Base.css

.gradient {
    background: #000 !important;
}
.full-unstyled-link,.price__regular {
    color: #fff !important;
}

Hope you find my answer helpful!
Best regards,
Richard | PageFly