title: How to change the position of a dialogue box Flutter
body: <p>I have created a dialogue box which displays when a number exists in Firestore when registering a new user. However by default Android seems to be positioning the dialogue box in the center of the display. Is there a way to position the dialog box lets say at the position of the widget in which its called from , for my case it the Raised button call back.
  Also would like to know how I can display from validation message in a pop just above a button, </p>
  
  <p>Below is a sample of my code.</p>
  
  <pre><code>  numberExistsDialog(BuildContext context) {
  var numberDialog = AlertDialog(
    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
    title: Text(
      'Number Already Exists',
      style: TextStyle(color: Colors.red),
      textAlign: TextAlign.center,
    ),
    content: Text(
      'Use another number',
      textAlign: TextAlign.center,
    ),
  );
  showDialog(
      context: context,
      builder: (BuildContext context) {
        return numberDialog;
      });
  </code></pre>
  
  <p>}</p>