.next::before, .prev::before {
    content: "" !important;
    display: block !important;
    width: 20px;
    height: 20px;
    border: solid 2px #4B4F6A;
     border-top: none;
}

.prev::before {
    border-right: none;
    transform: rotate(45deg);
}
.next::before {
    border-left: none;
    transform: rotate(-45deg);
}