slick arrow css
.slick-prev:before { content: "<"; color: red; font-size: 30px; } .slick-next:before { content: ">"; color: red; font-size: 30px; }
Source: stackoverflow.com
slick slider arrows
prevArrow: '<button class="slide-arrow prev-arrow"></button>', nextArrow: '<button class="slide-arrow next-arrow"></button>'