         contentView.layer.shadowRadius = 1.5
         contentView.layer.shadowOpacity = 0.5
         contentView.backgroundColor = .white
+        contentView.isHidden = true
         addSubview(contentView)
         
         // title view

    
    
    @objc open class func show(selected: Date? = nil, minimumDate: Date? = nil, maximumDate: Date? = nil) -> DateTimePicker {
        let dateTimePicker = DateTimePicker(frame: CGRect(x: 0,
                                                          y: 0,
                                                          width: screenWidth,
                                                          height: screenHeight))
        dateTimePicker.selectedDate = selected ?? Date()
        dateTimePicker.minimumDate = minimumDate ?? Date(timeIntervalSinceNow: -3600 * 24 * 365 * 20)
        dateTimePicker.maximumDate = maximumDate ?? Date(timeIntervalSinceNow: 3600 * 24 * 365 * 20)


import UIKit


@objc public class DateTimePicker: UIView {
    
    let contentHeight: CGFloat = 310
    
    // public vars
    public var backgroundViewColor = UIColor.clear {
        didSet {
