nrbt Hi
You can add custom css to override that rule:
.light-active .acm-hero.style-1 .acm-hero-item::after {
background: -webkit-gradient(linear, left top, right top, from(rgba(0, 0, 0, 0.6)), to(rgba(0, 0, 0, 0))) !important;
background: linear-gradient(to right, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0)) !important;
}
and adjust the value to suit your needs.
Regards