diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f5a214..33c63d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,12 @@
 # Changelog
+ - 1.7.0 (2023.05.18)
+   1. fix order of packages `inputenc` and `microtype`
+   2. replace package `url` with `xurl`
+   3. add package `booktabs`
+   4. add list of accented slovak characters for `lstlisting`
+   5. add style `code-listing` for code listings
+   6. fix referencing unknown language
+
  - 1.6.3 (2023.04.17)
    1. more thorough make clean
    2. fix slovak labels (Výpis, Algoritmus)
diff --git a/FEIstyle.cls b/FEIstyle.cls
index 39fba18..6baa2ba 100644
--- a/FEIstyle.cls
+++ b/FEIstyle.cls
@@ -1,5 +1,5 @@
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesClass{FEIstyle}[2023/04/17 v. 1.6.3 Thesis template - FEI STUBA]
+\ProvidesClass{FEIstyle}[2023/05/18 v. 1.7.0 Thesis template - FEI STUBA]
 
 % parse arguments
 \DeclareOption{dizp}{\def\typPraceSkr{dizp}
@@ -59,20 +59,19 @@
 \usepackage[overload]{textcase}
 \usepackage[acronym,nopostdot,nogroupskip,nonumberlist]{glossaries}
 
+\usepackage{microtype}
+\usepackage[utf8]{inputenc}
 % we should use ISO 690 & 690-2 http://www.fei.stuba.sk/sk/kniznica-fei/vzory-bibliografickych-odkazov-a-citovanie.html?page_id=1756 
 % package for biblatex https://github.com/michal-h21/biblatex-iso690
 \usepackage[backend=biber,style=iso-numeric,autolang=other,bibencoding=utf8,seconds=true]{biblatex}
 
 \ifnum\FEIenglish=0
-    \usepackage[slovak]{babel}
+    \usepackage[english,slovak]{babel}
 \else
     \usepackage[english]{babel}
 \fi
 
-\usepackage[utf8]{inputenc}
-
 \usepackage[style=slovak]{csquotes}
-\usepackage{microtype}
 \usepackage[T1]{fontenc}
 
 \usepackage[immediate]{silence}
@@ -98,17 +97,82 @@
 \usepackage{changepage}
 \usepackage{scrextend}
 \usepackage{xstring}
-\usepackage{url}
+\usepackage{xurl}
 \usepackage{enumitem}
 \usepackage{caption}
 \usepackage{subcaption}
 \usepackage[bookmarksopen,colorlinks,plainpages=false,urlcolor=blue,hypertexnames=false,unicode]{hyperref}
 \usepackage{algorithm}
 \usepackage{algorithmic}
+\usepackage{booktabs}
 % \usepackage{showframe} % debugging overflows
 
 % \cftsetpnumwidth{1.8em} % set the dots width in loX (f,t,l,a...) https://tex.stackexchange.com/q/369283/106389
 
+% https://stackoverflow.com/a/74266238
+\lstset{
+  extendedchars=true,
+  literate=
+    {á}{{\'a}}1
+    {ä}{{\"a}}1
+    {č}{{\v{c}}}1
+    {ď}{{\v{d}}}1
+    {é}{{\'e}}1
+    {í}{{\'i}}1
+    {ĺ}{{\'l}}1
+    {ľ}{{\v{l}}}1
+    {ň}{{\v{n}}}1
+    {ó}{{\'o}}1
+    {ô}{{\^o}}1
+    {ŕ}{{\'{r}}}1
+    {š}{{\v{s}}}1
+    {ť}{{\v{t}}}1
+    {ú}{{\'u}}1
+    {ý}{{\'y}}1
+    {ž}{{\v{z}}}1
+    {Á}{{\'A}}1
+    {Ä}{{\""A}}1
+    {Č}{{\v{C}}}1
+    {Ď}{{\v{C}}}1
+    {É}{{\'E}}1
+    {Í}{{\'I}}1
+    {Ĺ}{{\'L}}1
+    {Ľ}{{\v{L}}}1
+    {Ň}{{\v{N}}}1
+    {Ó}{{\'O}}1
+    {Ô}{{\^O}}1
+    {Ŕ}{{\'{R}}}1
+    {Š}{{\v{S}}}1
+    {Ť}{{\v{T}}}1
+    {Ú}{{\'U}}1
+    {Ý}{{\'Y}}1
+    {Ž}{{\v{Z}}}1
+}
+
+% https://www.overleaf.com/learn/latex/Code_listing
+\definecolor{codegreen}{rgb}{0,0.6,0}
+\definecolor{codegray}{rgb}{0.5,0.5,0.5}
+\definecolor{codepurple}{rgb}{0.58,0,0.82}
+\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
+\lstdefinestyle{code-listing}{
+    backgroundcolor=\color{backcolour},
+    commentstyle=\color{codegreen},
+    keywordstyle=\color{magenta},
+    numberstyle=\tiny\color{codegray},
+    stringstyle=\color{codepurple},
+    basicstyle=\ttfamily\footnotesize,
+    breakatwhitespace=false,
+    breaklines=true,
+    captionpos=b,
+    keepspaces=true,
+    numbers=none,
+    numbersep=5pt,
+    showspaces=false,
+    showstringspaces=false,
+    showtabs=false,
+    tabsize=2
+}
+
 \newboolean{isThesis}
 
 \IfEqCase*{\isThesis}{
diff --git a/includes/core.tex b/includes/core.tex
index e03774a..8b50739 100644
--- a/includes/core.tex
+++ b/includes/core.tex
@@ -10,7 +10,7 @@ \section{Možnosti anonymizácie}
 \subsection{Súkromné prehliadanie}
 \noindent Najpoužívanejšie internetové prehliadače súčasnosti majú v sebe zabudovanú funkcionalitu, ktorá dokáže čiastočne anonymizovať prístup na internet. Táto funkcionalita blokuje ukladanie navštívených stránok do histórie a nezaznamenáva súbory, ktoré sa stiahnu z~internetu. \acrshort{sw} a \acrlong{hw} sú skratky.
 
-\begin{table}[!htbp]
+\begin{table}[ht]
 \caption{Moduly a ich funkcie pri anonymizácii}
 \label{modulyVlastnosti}
 \begin{center}
@@ -35,12 +35,20 @@ \subsection{Súkromné prehliadanie}
 Proxify it & & &X  & X & &  &  &  &  &  &  &  &  &     \\  \hline
 I'm not here & & &  & X & &  &  &  &  &  &  &  &  &     \\  \hline
 Get edition & &X &X &X &X&X &  &  &  &  &  &  &  &     \\  \hline
-Anonymous browsing toolbar & & & X & X & &  &  &  &  &  &  &  &  &     \\  \hline
-Easy hide your IP and surf & & & X & X& &  &  & X & X & X & X &  &  &     \\  \hline
 \end{tabular}
 \end{center}
 \end{table}
 
+\begin{table}[ht]
+    \centering
+    \caption{Príklad tabuľky s použitím balíka \texttt{booktabs}}
+    \begin{tabular}{@{}ll@{}} \toprule
+         Veľkosť (B) & Typ správy \\ \midrule
+         8 & Nejaký typ správy \\ \bottomrule
+    \end{tabular}
+    \label{tab:my_label}
+\end{table}
+
 \subsection{Anonymná sieť}
 \noindent Anonymná sieť je sieť serverov, medzi ktorými dáta prechádzajú šifrované. V anonymných sieťach dáta prechádzajú z počítača používateľa, odkiaľ bola požiadavka poslaná, cez viaceré proxy smerovače, z ktorých každý správu doplní o smerovanie a zašifruje vlastným kľúčom. Cesta od ...
 
@@ -87,7 +95,8 @@ \subsection{Vzhľad}
 \begin{lstlisting}[
   caption={Ukážka algoritmu},
   label={lst:main-c},
-  language=c
+  language=c,
+  style=code-listing
 ]
 /* Hello World program */