From 7547b893d4421c193974a9e68989cfa20669ac11 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Mon, 10 Oct 2016 12:11:27 +0200
Subject: [PATCH] fixes ff overview rendering bug #1649

---
 css/reveal.css  |  5 ++++-
 css/reveal.scss | 10 ++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/css/reveal.css b/css/reveal.css
index c879c03..dbabfcb 100644
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -1001,6 +1001,8 @@ body {
           perspective-origin: 50% 50%;
   -webkit-perspective: 700px;
           perspective: 700px; }
+  .reveal.overview .slides {
+    -moz-transform-style: preserve-3d; }
   .reveal.overview .slides section {
     height: 100%;
     top: 0 !important;
@@ -1028,7 +1030,8 @@ body {
     overflow: visible; }
   .reveal.overview .backgrounds {
     -webkit-perspective: inherit;
-            perspective: inherit; }
+            perspective: inherit;
+    -moz-transform-style: preserve-3d; }
   .reveal.overview .backgrounds .slide-background {
     opacity: 1;
     visibility: visible;
diff --git a/css/reveal.scss b/css/reveal.scss
index c5ff05a..f6a37ad 100644
--- a/css/reveal.scss
+++ b/css/reveal.scss
@@ -1028,6 +1028,12 @@ body {
 	perspective-origin: 50% 50%;
 	perspective: 700px;
 
+	.slides {
+		// Fixes overview rendering errors in FF48+, not applied to
+		// other browsers since it degrades performance
+		-moz-transform-style: preserve-3d;
+	}
+
 	.slides section {
 		height: 100%;
 		top: 0 !important;
@@ -1060,6 +1066,10 @@ body {
 
 	.backgrounds {
 		perspective: inherit;
+
+		// Fixes overview rendering errors in FF48+, not applied to
+		// other browsers since it degrades performance
+		-moz-transform-style: preserve-3d;
 	}
 
 	.backgrounds .slide-background {