minDate.js

// Add this code to First Date

{
    minDate: "today",
    disableMobile: "true",
    onChange: function(selectedDate, dateString) {
        var date = selectedDate[0];
        flatpickr('.endingDate', {
            "minDate": date,
            dateFormat: "d.m.Y",
            disableMobile: "true"
        });
    }
}

//Add this class 'endingDate' to second dates element



// Add this css to your Forms custom css
.flatpickr-monthDropdown-months {
    -webkit-appearance: none !important;
  -webkit-border-radius: 0px;
}