diff --git a/cours/cours_beamer.cls b/cours/cours_beamer.cls
index 5af4056..1e81320 100644
--- a/cours/cours_beamer.cls
+++ b/cours/cours_beamer.cls
@@ -77,6 +77,7 @@
 % \colorlet{green}{green!40!gray}
 % \colorlet{blue}{airforceblue}
 
+% If colors are not set through a theme we set a default value
 \setbeamercolor*{definition}{fg=red,bg=blush!10!white}
 \setbeamercolor*{theorem}{fg=white,bg=red!90!white}
 \setbeamercolor*{property}{fg=white,bg=brickred!90!white}
@@ -267,19 +268,18 @@
 
 % Auxiliary command to set color of certain element of beamer
 \NewDocumentCommand \setbeamercolorto { g }{%
-  	% \setbeamercolor*{block title}{fg=#1,bg=#1!10!white}
-  	\setbeamercolor*{enumerate item}{fg=#1}
-    \setbeamercolor*{enumerate subitem}{fg=#1}
-    \setbeamercolor*{enumerate subsubitem}{fg=#1}
-	\setbeamercolor*{itemize item}{fg=#1}
-    \setbeamercolor*{itemize subitem}{fg=#1}
-    \setbeamercolor*{itemize subsubitem}{fg=#1}
-	\setbeamercolor*{item}{fg=#1}
+  	\setbeamercolor*{enumerate item}{fg=#1.fg}
+    \setbeamercolor*{enumerate subitem}{fg=#1.fg}
+    \setbeamercolor*{enumerate subsubitem}{fg=#1.fg}
+	\setbeamercolor*{itemize item}{fg=#1.fg}
+    \setbeamercolor*{itemize subitem}{fg=#1.fg}
+    \setbeamercolor*{itemize subsubitem}{fg=#1.fg}
+	\setbeamercolor*{item}{fg=#1.fg}
 }
 
 % déf(*)(TITRE)
 \NewDocumentEnvironment{déf}{ s g }{%begin
-	\setbeamercolor*{block title}{fg=definition,bg=blush!10!white}
+	\setbeamercolor*{block title}{parent=definition}
   	\setbeamercolorto{definition}
 	\IfBooleanTF #1
 	{
@@ -301,7 +301,7 @@
 
 % thm(TITRE)
 \NewDocumentEnvironment{thm}{ g }{%begin
-  	\setbeamercolor{block title}{fg=theorem,bg=red!90!white}
+  	\setbeamercolor*{block title}{parent=theorem}
 	\setbeamercolorto{theorem}
 	\IfNoValueTF {#1} {
 		\begin{block} {Théorème}
@@ -314,7 +314,7 @@
 
 % ppt(*)(TITRE)
 \NewDocumentEnvironment{ppt}{ s g }{%begin
-  	\setbeamercolor{block title}{fg=white,bg=brickred!90!white}
+  	\setbeamercolor*{block title}{parent=property}
 	\setbeamercolorto{property}
 	\IfBooleanTF #1
 	{
@@ -336,7 +336,7 @@
 
 % pre(TITRE)
 \NewDocumentEnvironment{pre}{ g }{%begin
-  	\setbeamercolor{block title}{fg=hanblue,bg=airforceblue!10!white}
+  	\setbeamercolor*{block title}{parent=proof}
 	\setbeamercolorto{proof}
 	\IfNoValueTF {#1} {
 		\begin{block} {Preuve}
@@ -349,7 +349,7 @@
 
 % voc(TITRE)
 \NewDocumentEnvironment{voc}{ g }{%begin
-	\setbeamercolor{block title}{fg=hanblue,bg=airforceblue!10!white}
+	\setbeamercolor*{block title}{parent=vocabulary}
   	\setbeamercolorto{vocabulary}
 	\IfNoValueTF {#1} {
 		\begin{block} {Vocabulaire}
@@ -362,7 +362,7 @@
 
 % rmq(TITRE)
 \NewDocumentEnvironment{rmq}{ G{Remarque} }{%begin
-  	\setbeamercolor{block title}{fg=blush,bg=blush!10!white}
+  	\setbeamercolor*{block title}{parent=remark}
 	\setbeamercolorto{remark}
 	\begin{block} {\faExclamationTriangle \hspace{.125em} #1}
 }{%end
@@ -372,7 +372,7 @@
 % met<0|i|I|a|A|1>(TITRE)
 \newcounter{methodecounter}
 \NewDocumentEnvironment{met} { O{0} g }{%begin
-  	\setbeamercolor{block title}{fg=black,bg=amber!75!white}
+  	\setbeamercolor*{block title}{parent=method}
 	\setbeamercolorto{method}
 	\ifthenelse{ \NOT \equal{#1}{0} }{
 		\ifthenelse{ \equal{#1}{i} }
@@ -419,7 +419,7 @@
 
 % exe(TITRE)
 \NewDocumentEnvironment{exe}{ G{Exemple} }{%begin
-  	\setbeamercolor{block title}{fg=darkspringgreen,bg=green!10!white}
+  	\setbeamercolor*{block title}{parent=example}
 	\setbeamercolorto{example}
 	\begin{block} {\faLightbulbO \hspace{.125em} #1}
 }{%end
@@ -429,7 +429,7 @@
 % exo<0|i|I|a|A|1>(TITRE)
 \newcounter{exercicecounter}
 \NewDocumentEnvironment{exo} { O{0} G{Exercice} }{%begin
-	\setbeamercolor{block title}{fg=white,bg=airforceblue!90!white}
+	\setbeamercolor*{block title}{parent=exercise}
 	\setbeamercolorto{exercise}
 	\ifthenelse{ \NOT \equal{#1}{0} }{
 		\ifthenelse{ \equal{#1}{i} }
@@ -469,7 +469,7 @@
 % app<0|i|I|a|A|1>(TITRE)
 \newcounter{applicationcounter}
 \NewDocumentEnvironment{app} { O{0} G{Application} }{%begin
-  	\setbeamercolor{block title}{fg=white,bg=airforceblue!90!white}
+  	\setbeamercolor*{block title}{parent=application}
 	\setbeamercolorto{application}
 	\ifthenelse{ \NOT \equal{#1}{0} }{
 		\ifthenelse{ \equal{#1}{i} }