tweaks to blood theme

css/theme/source/blood.scss

@@ -24,6 +24,8 @@ $blood: #a23;
 $coal: #222;
 $codeBackground: #23241f;
 
+$backgroundColor: $coal;
+
 // Main text
 $mainFont: Ubuntu, 'sans-serif';
 $mainFontSize: 36px;
@@ -45,10 +47,6 @@ $linkColorHover: lighten( $linkColor, 20% );
 $selectionBackgroundColor: $blood;
 $selectionColor: #fff;
 
-// Background generator
-@mixin bodyBackground() {
-    @include radial-gradient( $coal, lighten( $coal, 25% ) );
-}
 
 // Theme template ------------------------------
 @import "../template/theme";
@@ -61,7 +59,7 @@ $selectionColor: #fff;
     text-shadow: 1px 1px $coal;
 }
 
-.reveal h1, 
+.reveal h1,
 .reveal h2,
 .reveal h3,
 .reveal h4,
@@ -70,16 +68,6 @@ $selectionColor: #fff;
     font-weight: 700;
 }
 
-.reveal a,
-.reveal a:hover {
-    text-shadow: 2px 2px 2px #000;
-}
-
-.reveal small a,
-.reveal small a:hover {
-    text-shadow: 1px 1px 1px #000;
-}
-
 .reveal p code {
     background-color: $codeBackground;
     display: inline-block;