.item{
margin: 5px;
}
.owl-item:nth-child(3n+1) > .item {
margin-left: 0;
}
.owl-item:nth-child(3n+3) > .item {
margin-right: 0;
}
Config OwlCarousel:
$("#owl-highlight").owlCarousel({
autoPlay: 3000,
items : 3,
scrollPerPage: true,
itemsDesktop : [1199,3],
itemsDesktopSmall : [979,3]
});