diff -r e28d7a327870 -r 4fee50f38305 langs.sty
--- a/langs.sty	Sun May 07 03:01:29 2017 +0100
+++ b/langs.sty	Tue May 09 12:31:55 2017 +0100
@@ -39,27 +39,6 @@
   otherkeywords={=,!=,:=,<,>,\%;*,/},
 }[keywords,comments,strings]
 
-\lstdefinestyle{mystyle}
-       {basicstyle=\ttfamily,
-	keywordstyle=\color{codepurple}\bfseries,
-	stringstyle=\color{codegreen},
-	commentstyle=\color{codegreen},
-	morecomment=[s][\color{codedocblue}]{/**}{*/},
-	numbers=left,
-	numberstyle=\tiny\color{black},
-	stepnumber=1,
-	numbersep=10pt,
-	tabsize=2,
-	showspaces=false,
-	showstringspaces=false,
-        xleftmargin=8mm,
-        emphstyle=\color{codeblue}\bfseries,
-        keepspaces
-}
-
-\lstset{language=Scala,
-        style=mystyle}
-
 
 \newcommand{\code}[1]{{\lstinline{#1}}}
 \newcommand{\pcode}[1]{\mbox{\lstset{language={},keywordstyle=\color{black}}\lstinline!#1!}}
@@ -69,8 +48,29 @@
 %%\lstset{escapeinside={(*@}{@*)}}
 \lstset{escapeinside={/*@}{@*/}}
 
-
-
 %% stripy code
 \usepackage{lstlinebgrd}
 \definecolor{capri}{rgb}{0.0, 0.75, 1.0}
+
+
+\lstdefinestyle{mystyle}
+       {basicstyle=\ttfamily,
+	keywordstyle=\color{codepurple}\bfseries,
+	stringstyle=\color{codegreen},
+	commentstyle=\color{codegreen},
+	morecomment=[s][\color{codedocblue}]{/**}{*/},
+	numbers=none,
+	numberstyle=\tiny\color{black},
+	stepnumber=1,
+	numbersep=10pt,
+	tabsize=2,
+	showspaces=false,
+	showstringspaces=false,
+        xleftmargin=8mm,
+        emphstyle=\color{codeblue}\bfseries,
+        keepspaces,
+        linebackgroundcolor={\ifodd\value{lstnumber}\color{capri!3}\fi}
+}
+
+\lstset{language=Scala,
+        style=mystyle}