update slide backgrounds example

test/examples/slide-backgrounds.html

@@ -36,7 +36,7 @@
 				</section>
 
 				<section data-background-color="lightblue">
-					<h2>data-background: ----</h2>
+					<h2>data-background: lightblue</h2>
 				</section>
 
 				<section>
@@ -58,7 +58,7 @@
 					<section>
 						<h2>Background applied to stack</h2>
 					</section>
-					<section data-background="rgba(100, 0, 0, 0.2)">
+					<section data-background="rgb(66, 66, 66)">
 						<h2>Background applied to slide inside of stack</h2>
 					</section>
 				</section>