Hi

Thanks for contacting us. You can use this custom CSS

.automotive-hero-sldier.sppb-addon.sppb-carousel-extended .sppb-carousel-extended-content-wrap{
        background: linear-gradient(95.55deg, #ad5275 4.25%, #3f1a0a 93.67%) !important;
}

Path towards custom CSS: Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

-Regards.