.fade-in {
    opacity: 0;
    transition: opacity 0.5s ease-in;
}

.fade-in.show {
    opacity: 1;
}

.fade-out {
    opacity: 1;
    transition: opacity 0.5s ease-out;
}

.fade-out.hide {
    opacity: 0;
}

.card-dragging {
    opacity: 0.5;
}