.icon {
    position: relative;
}
.icon.-hasHover .hover-icon {
    position: absolute; z-index: 5;
    left: 0; top: 0;
    opacity: 0;
}
.icon.-hasHover:hover .base-icon {
    opacity: 0;
}
.icon.-hasHover:hover .hover-icon {
    opacity: 1;
}