From f0f48bd9b06ffdd22f264ca5f644666347944ceb Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Thu, 3 Apr 2014 10:51:27 +0200
Subject: [PATCH] use flexbox for vertically centered printing #862

---
 css/print/pdf.css | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/css/print/pdf.css b/css/print/pdf.css
index 41f70c60..bf90b3d3 100644
--- a/css/print/pdf.css
+++ b/css/print/pdf.css
@@ -188,3 +188,12 @@ ul, ol, div, p {
 .reveal small a {
 	font-size: 16pt !important;
 }
+
+.reveal.center .slides section:not(.stack) {
+	display: flex !important;
+	flex-direction: column;
+	align-items: center;
+	justify-content: center;
+	padding-top: 2em !important;
+	padding-bottom: 2em !important;
+}