title: How to add drop shadow to TextFormField In Flutter
body: <p>I have a text form field in flutter I want to add a drop shadow to it. how should I do that?</p>
  <pre><code> final password = TextFormField(
      obscureText: true,
      autofocus: false,
      decoration: InputDecoration(
          icon: new Icon(Icons.lock, color: Color(0xff224597)),
          hintText: 'Password',
          fillColor: Colors.white,
          filled: true,
          contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
          enabledBorder: OutlineInputBorder(borderRadius:BorderRadius.circular(5.0),
          borderSide: BorderSide(color: Colors.white, width: 3.0))
       ),
     );
  </code></pre>