Flutter: Outline input border

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What your looking for is – enabledBorder property of InputDecoration.

If you want to Change Border on focus use – focusedBorder

    TextField(
        decoration: new InputDecoration(
            focusedBorder: OutlineInputBorder(
                borderSide: BorderSide(color: Colors.greenAccent, width: 5.0),
            ),
            enabledBorder: OutlineInputBorder(
                borderSide: BorderSide(color: Colors.red, width: 5.0),
            ),
            hintText: 'Mobile Number',
        ),
    ),

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