Hi Johnny,
only via custom CSS, override-change default line colors (blue, orange, purple)
.edulif-university-home-testimonial-wrapper .sppb-carousel-extended-list .sppb-carousel-extended-outer-stage .sppb-carousel-extended-item::after {
background-color: #1cbef0; }
.edulif-university-home-testimonial-wrapper .sppb-carousel-extended-list .sppb-carousel-extended-outer-stage .sppb-carousel-extended-item:nth-child(2n)::after {
background-color: #f7bb00;
}
.edulif-university-home-testimonial-wrapper .sppb-carousel-extended-list .sppb-carousel-extended-outer-stage .sppb-carousel-extended-item:nth-child(3n)::after {
background-color: #7b1fff;
}
use solid name colors or hex # colors!