diff --git a/presentation/main.tex b/presentation/main.tex
index c48eeb1..2a664e7 100644
--- a/presentation/main.tex
+++ b/presentation/main.tex
@@ -3,7 +3,7 @@
 %	Struktur und Pointer Referat
 %   20.04.2020
 %----------------------------------------------------------------------------------------
-\usetheme{focus}
+\usetheme[nofirafonts]{focus}
 
 
 \usepackage[utf8]{inputenc}
@@ -15,10 +15,16 @@
 \usepackage{bbm}
 \usepackage{hyperref}
 \usepackage{graphicx}
-\usepackage{listings}
 \usepackage{xcolor}
 \usepackage{mathtools}
 
+\RequirePackage[T1]{fontenc}
+
+\PassOptionsToPackage{sfdefault}{FiraSans}
+\RequirePackage{FiraSans}
+
+\RequirePackage{FiraMono}
+
 % Farbdefinitionen
 \definecolor{backgroundcoloreq}{RGB}{180,140,0}
 \definecolor{codegreen}{rgb}{0,0.6,0}
@@ -30,31 +36,6 @@
 \DeclareMathAlphabet{\mathcal}{OMS}{cmbrs}{m}{n}
 
 
-\lstset{
-    language=C,
-    basicstyle=\ttfamily,
-    numbers=left,
-    numberstyle=\tiny,
-    tabsize=4,
-    columns=fixed,
-    showstringspaces=false,
-    showtabs=false,
-    breaklines=true,
-    keepspaces,
-    morekeywords={std},
-    keywordstyle=\color{blue}\ttfamily,
-    stringstyle=\color{red}\ttfamily,
-    commentstyle=\color{OliveGreen!85}\ttfamily,
-    numberstyle=\tiny\color{codegray},
-    basicstyle=\footnotesize\selectfont\ttfamily,
-% keyword highlighting
-    classoffset=1, % starting new class
-    otherkeywords={>,<,.,;,-,+,!,=,~,:,[,],NULL,&},
-    morekeywords={>,<,.,;,-,+,!,=,~,:,[,],NULL,&},
-    keywordstyle=\color{codeorange},
-    classoffset=0
-}
-
 %----------------------------------------------------------------------------------------
 %	 TITLE SLIDE
 %----------------------------------------------------------------------------------------