.ggbc-carousel{position:relative;height:400px;background:url('https://picsum.photos/1200/600') center/cover}
.ggbc-overlay{position:absolute;inset:0;opacity:.6}

/* solid */
.ggbc-overlay-type-solid .ggbc-overlay{background:#000}

/* gradient */
.ggbc-overlay-type-gradient .ggbc-overlay{
background:linear-gradient(to right,rgba(0,0,0,0.8),transparent);
}

/* shadow premium */
.ggbc-overlay-type-shadow.ggbc-overlay-left .ggbc-overlay{
background:linear-gradient(to right,rgba(0,0,0,0.7),transparent);
}
.ggbc-overlay-type-shadow.ggbc-overlay-right .ggbc-overlay{
background:linear-gradient(to left,rgba(0,0,0,0.7),transparent);
}
.ggbc-overlay-type-shadow.ggbc-overlay-top .ggbc-overlay{
background:linear-gradient(to bottom,rgba(0,0,0,0.7),transparent);
}
.ggbc-overlay-type-shadow.ggbc-overlay-bottom .ggbc-overlay{
background:linear-gradient(to top,rgba(0,0,0,0.7),transparent);
}