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extension UITextField {
    func setBottomBorder() {
        self.borderStyle = .none
        self.layer.backgroundColor = UIColor.white.cgColor
        
        self.layer.masksToBounds = false
        self.layer.shadowColor = UIColor.gray.cgColor
        self.layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
        self.layer.shadowOpacity = 1.0
        self.layer.shadowRadius = 0.0
    }
}