.notif-collapse {
    overflow: hidden;
    transition: height 200ms ease, margin 200ms ease, padding 200ms ease, opacity 150ms ease;
}

.notif-collapsing {
    opacity: 0;
    height: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
    border-width: 0 !important;
}