\documentclass[12pt, a4paper,oneside]{article}

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% alle benötigten Pakete werden hier eingebunden
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\usepackage{german}
\usepackage[utf8]{inputenc} %Damit man ohne Probleme Umlaute eingeben kann
\usepackage{fancyhdr}
\usepackage{eso-pic} %% AddtoShipPicture nutzen
\usepackage{booktabs}
\usepackage{xcolor}
\usepackage{longtable}
\usepackage{graphicx}
\usepackage{longtable} %lange Tabellen über mehrere Seiten erstellen
\usepackage{lastpage}
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% Selbst definierte Style-Dateien
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\newenvironment{blatt}[2]
{
  \ClearShipoutPicture
  \AddToShipoutPicture{
    \renewcommand{\headrulewidth}{0.0pt}
    \renewcommand{\footrulewidth}{0.0pt}
    \thicklines
    \put(50,42){\framebox(500,755){}}
    \put(39,66){\rotatebox{90}{\makebox(100,7)[l]{\scriptsize{\tt \VAR{full_folder}}}}}
    \put(555,94){\rotatebox{90}{\makebox(100,22)[l]{\bfseries #1\,(\thepage/\,\pageref{LastPage})}}}
    \put(555,66){\includegraphics[height=20pt]{icons/#2}}
    \put(65,30){\makebox(100,7)[l]{\scriptsize \today }}
  }
}
{
  \newpage
}


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% Einzug verändert und größerer Zeilenabstand
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\parindent0.0em                        % 1. Zeile nicht einrücken

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% Schriftart
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\renewcommand\familydefault{\sfdefault}

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% Abstände
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\pagestyle{empty}
% Größe des Textbereiches in der Seite
\setlength{\textwidth}{16.4cm}
\setlength{\textheight}{24.5cm}
% Kopf- und Fußzeile, Höhe und Abstand vom Text
\setlength{\headheight}{0pt}
\setlength{\headsep}{0pt}
\setlength{\topmargin}{-1cm}
% Linker Seiteneinzug
\setlength{\oddsidemargin}{2.35cm} \addtolength{\oddsidemargin}{-1in}
\setlength{\evensidemargin}{2.35cm} \addtolength{\evensidemargin}{-1in}
\addtolength{\topmargin}{1.1cm}
\setlength{\parskip}{0,75em}

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% Überschriftformatierung
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\usepackage{titlesec}
\titleformat{name=\section}[block]
  {\large}
  {}
  {0pt}
  {\colorsection}
\titlespacing*{\section}{0pt}{\baselineskip}{\baselineskip}

\newcommand{\colorsection}[1]{%
	\colorbox{black!25}{\parbox{\dimexpr\textwidth-2\fboxsep}{\bf #1}}}

\titleformat{name=\subsection}[block]
{\large}
{}
{0pt}
{\colorsubsection}
\titlespacing*{\subsection}{0pt}{\baselineskip}{\baselineskip}

\newcommand{\colorsubsection}[1]{%
	\colorbox{black!10}{\parbox{\dimexpr\textwidth-2\fboxsep}{#1}}}


\begin{document}
%Schriftart setzen

\begin{blatt}{Titel des Dokuments}{info}  % Possible Icons: folie, info, merk, station
	\section{Überschrift}
	Text
\end{blatt}

\end{document}