title: In Flutter, how do you set *all* the scaffold background color at once?
body: <p>Currently, I set background color of <em>each screen</em> using this:</p>
  <pre><code>  @override
    Widget build(BuildContext context) =&gt; Scaffold(
      backgroundColor: Colors.white,
      body: ...
    );
  </code></pre>
  <p>Every time I create new screen, I always forgot to add this background color setter. This is a minor inconvenience, but I really appreciate if there's a method to set this background color once for all screens, unless overridden by <code>backgroundColor</code> property of specific <code>Scaffold</code>. I have tried to set the color on <code>MaterialApp</code>'s <code>color</code> property, but it doesn't look like it has any effect.</p>