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-rw-r--r--manual/presentation.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/manual/presentation.tex b/manual/presentation.tex
index ee96253a0..dc5127755 100644
--- a/manual/presentation.tex
+++ b/manual/presentation.tex
@@ -74,7 +74,7 @@
{\usebeamerfont{subsection name}\usebeamercolor[fg]{subsection name}of \sectionname~\insertsectionnumber}
\vskip1em\par
\setbeamercolor{graybox}{bg=gray}
-\begin{beamercolorbox}[sep=8pt,center,bg=gray]{graybox}
+\begin{beamercolorbox}[sep=8pt,center]{graybox}
\usebeamerfont{subsection title}\insertsection\par
\end{beamercolorbox}
\end{centering}}