Implement section page using the built-in beamer template

beamerthemem.sty

@@ -206,20 +206,34 @@
 %}}}
 %{{{ --- Sections ---------------------
 
+\setbeamertemplate{section page}
+{
+  \vspace{2em}
+  \centering
+  \begin{minipage}{22em}
+    \usebeamercolor[fg]{section title}
+    \usebeamerfont{section title}
+    \insertsectionHEAD\\[-1ex]
+    \progressbar{\textwidth}
+  \end{minipage}
+  \par
+}
+
+
 % Insert frame with section title at every section start
+\if@noSectionSlide\else%
   \AtBeginSection[]
   {
-  \if@noSectionSlide%
+    \ifbeamer@inframe
-  \else%
+      \sectionpage
+    \else
       \begingroup
-  \setbeamercolor{background canvas}{parent=palette primary}
+      \setbeamercolor{background canvas}{parent=palette secondary}
-  \begin{frame}[plain]
+      \frame[plain]{\sectionpage}
-    \vspace{2em}\usebeamerfont{section title}
-    \progressbar{\textwidth}
-  \end{frame}
       \endgroup
-  \fi%
+    \fi
   }
+\fi
 
 %}}}
 %{{{ --- Captions ---------------------