.flatpickr-confirm {
    height: 40px;
    max-height: 0;
    visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    background: rgba(0,0,0,.06)
}

    .flatpickr-confirm svg path {
        fill: inherit
    }

    .flatpickr-confirm.darkTheme {
        color: #fff;
        fill: #fff
    }

    .flatpickr-confirm.visible {
        max-height: 40px;
        visibility: visible
    }