.ui-datepicker.ui-widget > .ui-datepicker-header {
    background: #000 !important;
}

.ui-datepicker.ui-widget td.ui-datepicker-today > a {
    background: #444 !important;
    color: #fff !important;
    border-color: #444 !important;
}

.ui-datepicker.ui-widget td.ui-datepicker-today {
    background: #000 !important;
    color: #fff !important;
    border-color: #000 !important;
}