use listings

datenschleuder.cls

@@ -81,6 +81,21 @@
 
 \RequirePackage{fmtcount}
 
+\RequirePackage{listings}
+\lstset{%
+	upquote=true,
+	basicstyle=\ttfamily,
+	%backgroundcolor=\color{lightgray},
+	%frame=single,
+	stringstyle=\color{brown},
+	keywordstyle=\color{yellow},
+%  identifierstyle=\color{green},
+	commentstyle=\color{gray},
+	keywordstyle=[2]\color{darkgray},
+	keywordstyle=[3]\color{darkgray},
+	tabsize=2
+}
+
 \RequirePackage{scrlayer-scrpage}
 \RequirePackage{graphicx}
 \RequirePackage{tikz}