title: RaisedButton rendered with a semi-transparent gray fill in Flutter
body: <p>I have a RaisedButton inside a Column, which is inside a Stack</p>
  
  <pre><code>Stack(
     children: [
         PageView(
           children: [...],
         ),
         Column(
           crossAxisAlignment: CrossAxisAlignment.center,
           mainAxisAlignment: MainAxisAlignment.end, 
           children: [
             RaisedButton(
               color: Colors.teal,
               child: Text("Button"),
             ),
             ...
             ),
           ...
  </code></pre>
  
  <p>However, instead of the button being rendered with a teal fill, it is gray and semi-transparent.
  <a href="https://i.stack.imgur.com/m16oo.png" rel="noreferrer">Here it is on top of an orange Container.</a></p>
  
  <p>Is there any way for me to force this button to be teal?</p>