diff --git a/jl-cours/mdframed.tex b/jl-cours/mdframed.tex
index 684d6a6..b25b90f 100644
--- a/jl-cours/mdframed.tex
+++ b/jl-cours/mdframed.tex
@@ -76,7 +76,7 @@
   tikzsetting={draw=black,line width=.5pt},%
   leftmargin=2pt,rightmargin=0,%
   innertopmargin=1em,innerbottommargin=1em,%
-  innerleftmargin=.5em,innerrightmargin=.5em,%
+  innerleftmargin=.75em,innerrightmargin=.5em,%
   skipabove=0,skipbelow=0,%
   frametitlerule=false,%
   frametitlebackgroundcolor=white!0,%
diff --git a/shortcuts/shortcuts.sty b/shortcuts/shortcuts.sty
index 6de6345..c591a4b 100644
--- a/shortcuts/shortcuts.sty
+++ b/shortcuts/shortcuts.sty
@@ -141,6 +141,12 @@
 	\ensuremath{ \vec{\jmath} }
 }
 
+%% basis (i,j)
+%%
+\RenewDocumentCommand \ij { } {
+  \ensuremath{ \left(\vec{\imath}\; ;\; \vec{\jmath}\right) }
+}
+
 %% frame (O;i;j)
 %%
 \NewDocumentCommand \oij { } {
@@ -162,7 +168,11 @@
 %% vector arrow redefinition
 %%
 \renewcommand{\Vec}[1]{
-  \overrightarrow{#1\vphantom(}
+  \ensuremath{ \overrightarrow{#1\vphantom(} }
+}
+
+\renewcommand{\vec}[1]{
+  \ensuremath{ \overrightarrow{#1\vphantom(} }
 }
 
 %% positional notation