.st-button-prev,
.st-button-next {
    z-index: 100 !important;
}

.st-sliders.style-1::before {
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    content: "";
    z-index: 10;
    background-color: rgba(0, 0, 0, 0.3);
}