.slick-prev:before,
.slick-next:before {
    font-family: 'slick';
    font-size: 36px;
    color: var(--gray);
    /* Change as desired */
    line-height: 1;
}

.slick-prev:before {
    content: '\2190' !important;
    /* Left arrow Unicode */
}

.slick-next:before {
    content: '\2192' !important;
    /* Right arrow Unicode */
}