diff --git a/tools/style/base.sty b/tools/style/base.sty
index f8d2896..0565651 100755
--- a/tools/style/base.sty
+++ b/tools/style/base.sty
@@ -15,6 +15,11 @@
 \RequirePackage{gensymb}
 \RequirePackage{ifthen, calc}
 \RequirePackage{tabularx}
+\RequirePackage{enumitem}
+
+% Marges des pages
+\RequirePackage{geometry}
+\geometry{left=10mm,right=10mm, top=10mm}
 
 % Symbole euro
 \RequirePackage{eurosym}
diff --git a/tools/style/myXsim.sty b/tools/style/myXsim.sty
index 9c0629c..3638100 100644
--- a/tools/style/myXsim.sty
+++ b/tools/style/myXsim.sty
@@ -44,6 +44,7 @@
             \GetExercisePropertyT{subtitle}
             {{\PropertyValue}}%
         }%
+        \noindent
     }
 }{}
 \xsimsetup{exercise/template=exo}
diff --git a/tools/style/myhdr.sty b/tools/style/myhdr.sty
index c429dad..5ded0ef 100644
--- a/tools/style/myhdr.sty
+++ b/tools/style/myhdr.sty
@@ -74,7 +74,7 @@
 \renewcommand{\footrulewidth}{0pt}
 
 \newcommand{\op@boiteentete}{\makebox[0pt][l]{\hspace*{-3ex}%
-    \color{bgentete}\rule[-0.8ex]{\textwidth+5ex}{3ex}%
+    \color{bgentete}\rule[-0.8ex]{\textwidth-5ex}{3ex}%
     }}
 \lhead{\scriptsize\op@boiteentete \@title}
 \chead{}