title: Flutter - How to use an RGB or HEX value for a Widget Container Color
body: <p>I have a container in my app that I would like to use a specific fill color for but i have bee unable to figure it out.  I have no problem specifically using the <code>Colors.grey[500]</code> but I would like to use a color that isn't in the Material Color library.  I would really like to use <code>color: new Color.fromRGBO(200, 150, 150, 1.0)</code> but this throws an error.  </p>
  
  <p>Can anyone point me in the right direction to be able to assign an RGB or a HEX value to a widget <code>color:</code> attribute?</p>
  
  <p>The error/warning I was getting when I hover over the line of code in Android Studio:</p>
  
  <pre><code>The argument type 'Color(...color.dart)' can't be assigned to the parameter 'Color(...painting.dart)'
  </code></pre>