.flatpickr-confirm {
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
            align-items: center;
    -webkit-box-pack: center;
            justify-content: center;
    visibility: hidden;
    cursor: pointer;
    background: whitesmoke;
    height: 2.25rem;
    max-height: 0;
}

.flatpickr-confirm svg path {
    fill: inherit;
}

.flatpickr-confirm.visible {
    visibility: visible;
    max-height: 2.25rem;
}