diff --git a/ws/Docbook/CustomLayer/webhelp/reveal.css.patch b/ws/Docbook/CustomLayer/webhelp/reveal.css.patch
new file mode 100644
index 0000000000000000000000000000000000000000..bdc0fdf00640a910a982c40203ffef2406cadee4
--- /dev/null
+++ b/ws/Docbook/CustomLayer/webhelp/reveal.css.patch
@@ -0,0 +1,20 @@
+--- reveal.css.orig	2017-09-20 21:41:43.190984695 +0200
++++ reveal.css	2017-09-21 17:42:07.671682270 +0200
+@@ -1,3 +1,8 @@
++/*
++ *  patched by: /usr/share/hdm-docbook-xsl/CustomLayer/webhelp/reveal.css.patch 
++ *  source file: /usr/share/reveal.js/css/reveal.css
++ */
++
+ /*!
+  * reveal.js
+  * http://lab.hakim.se/reveal-js
+@@ -26,7 +31,7 @@
+   border: 0;
+   font-size: 100%;
+   font: inherit;
+-  vertical-align: baseline; }
++  vertical-align: top; }
+ 
+ .reveal article, .reveal aside, .reveal details, .reveal figcaption, .reveal figure,
+ .reveal footer, .reveal header, .reveal hgroup, .reveal menu, .reveal nav, .reveal section {
diff --git a/ws/Docbook/Preprocess/make.rules b/ws/Docbook/Preprocess/make.rules
index 8b759a92061e8ae71ff6d969ca4095d6ac1189d8..bf449887d49276ceac157e7aa59c56e6b48cc912 100644
--- a/ws/Docbook/Preprocess/make.rules
+++ b/ws/Docbook/Preprocess/make.rules
@@ -109,6 +109,7 @@ SAXONCMD=java -cp "${DBOOK_XSL}/tools/lib/saxon9he.jar:/usr/share/java/xercesImp
 	${SAXON6CMD} $< ${DBOOK_XSL_CUSTOM}/webhelp/webhelpHdm.xsl ${dbookXslWebhelpParam}
 	rsync -a ${DBOOK_XSL}/webhelp/template/* .     # Images, Css
 	cd common/css; patch < ${DBOOK_XSL_CUSTOM}/webhelp/positioning.css.patch
+	cd reveal.js/css; patch < ${DBOOK_XSL_CUSTOM}/webhelp/reveal.css.patch
 	cp ${DBOOK_XSL_CUSTOM}/webhelp/common/images/*.svg common/images
 	cp ${DBOOK_XSL_CUSTOM}/webhelp/common/images/favicon.ico .
 	rsync -a --exclude='.git' /usr/share/hdmwebhelp/extern/libs/mathjax .