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flutter text form field change underline color

decoration: InputDecoration(        
  enabledBorder: UnderlineInputBorder(      
    borderSide: BorderSide(color: theColor),   
  ),  
  focusedBorder: UnderlineInputBorder(
    borderSide: BorderSide(color: theColor),
  ),
  border: UnderlineInputBorder(
    borderSide: BorderSide(color: theColor),
  ),
)

How to Change the underline Color of TextFormField

TextField(
 decoration: InputDecoration(
    enabledBorder: UnderlineInputBorder(borderSide: BorderSide(color: Colors.red,width: 2.0)),
    focusedBorder: UnderlineInputBorder(borderSide: BorderSide(color: Colors.teal,width: 5.0)),
    labelText: 'Your Email or Phone'
  )
)