use outer color of radial gradient as solid fallback

css/theme/beige.css

@@ -1,5 +1,5 @@
 @import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
-/*
+/**
  * Beige theme for reveal.js.
  * 
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
@@ -16,7 +16,7 @@
  * GLOBAL STYLES
  *********************************************/
 body {
-  background: white;
+  background: #f7f2d3;
   background: -moz-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);
   background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, white), color-stop(100%, #f7f2d3));
   background: -webkit-radial-gradient(center, circle cover, white 0%, #f7f2d3 100%);

css/theme/default.css

@@ -1,5 +1,5 @@
 @import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
-/*
+/**
  * Default theme for reveal.js.
  * 
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
@@ -16,7 +16,7 @@
  * GLOBAL STYLES
  *********************************************/
 body {
-  background: #555a5f;
+  background: #1c1e20;
   background: -moz-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);
   background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #555a5f), color-stop(100%, #1c1e20));
   background: -webkit-radial-gradient(center, circle cover, #555a5f 0%, #1c1e20 100%);

css/theme/serif.css

@@ -1,4 +1,4 @@
-/*
+/**
  * A simple theme for reveal.js presentations, similar 
  * to the default theme. The accent color is darkblue.
  * 

css/theme/simple.css

@@ -1,6 +1,6 @@
 @import url(http://fonts.googleapis.com/css?family=News+Cycle:400,700);
 @import url(http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic);
-/*
+/**
  * A simple theme for reveal.js presentations, similar 
  * to the default theme. The accent color is darkblue.
  * 

css/theme/sky.css

@@ -1,6 +1,6 @@
 @import url(http://fonts.googleapis.com/css?family=Quicksand:400,700,400italic,700italic);
 @import url(http://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700);
-/*
+/**
  * Sky theme for reveal.js.
  * 
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
@@ -9,7 +9,7 @@
  * GLOBAL STYLES
  *********************************************/
 body {
-  background: #f7fbfc;
+  background: #add9e4;
   background: -moz-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);
   background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, #f7fbfc), color-stop(100%, #add9e4));
   background: -webkit-radial-gradient(center, circle cover, #f7fbfc 0%, #add9e4 100%);

css/theme/template/mixins.scss

@@ -19,7 +19,7 @@
 }
 
 @mixin radial-gradient( $outer, $inner, $type: circle ) {
-	background: $inner;
+	background: $outer;
 	background: -moz-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );
 	background: -webkit-gradient( radial, center center, 0px, center center, 100%, color-stop(0%,$inner), color-stop(100%,$outer) );
 	background: -webkit-radial-gradient( center, $type cover,  $inner 0%, $outer 100% );