.sb-slider.owl-carousel .owl-item img {
    width: 100%;
    height: 645px;
    margin: auto;
    /*object-fit: contain;*/
}
.sb-slider.owl-carousel .owl-nav {
    display:none;
}

@media screen and (max-width: 800px)
{
.sb-slider.owl-carousel .owl-item img {
    width: 100%;
    /*height: 645px;*/
    height: auto;
    margin: auto;
    object-fit: contain;
}
.sb-slider.owl-carousel .owl-nav {
    display:none;
}
}