structure.tex: New lst style plaintxt

structure.tex

@@ -106,6 +106,13 @@
     numbersep=8pt,
     rulecolor=\color{black},
 }
+\lstdefinestyle{plaintxt}{
+    language=TeX,
+    numbers=none,
+    frame=trBL,
+    frameround=fttt,
+    backgroundcolor=\color{white},
+}
 
 
 \geometry{a4paper,margin=2cm}