.owl-nav .owl-prev:before {
    font-family: 'Material Icons';
    content: "keyboard_arrow_left";
    display: inline-block;
    color: black;
}
.owl-nav .owl-next:before {
    font-family: 'Material Icons';
    content: "keyboard_arrow_right";
    display: inline-block;
    color: black;
}