simplify stack css

css/reveal.scss

@@ -230,8 +230,6 @@ html.reveal-full-page {
 // Layout helper: Stack multiple elements on top of each other
 .reveal .r-stack {
 	display: grid;
-	justify-content: center;
-    align-items: center;
 }
 
 .reveal .r-stack > * {

dist/reveal.css

@@ -5,4 +5,4 @@
 *
 * Copyright (C) 2020 Hakim El Hattab, https://hakim.se
 */
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