\documentclass{beamer}
%\documentclass[notes=only]{beamer} %for notes slides

\usepackage{thumbpdf}
\usepackage{wasysym}
\usepackage{ucs}
\usepackage[utf8]{inputenc}
\usepackage{pgf,pgfarrows,pgfnodes,pgfautomata,pgfheaps,pgfshade}
\usepackage{pgfpages}
\usepackage{verbatim}
\usepackage{fancyvrb}
\usepackage{multimedia}
\usepackage{caption}
%\usepackage{subcaption}
\usepackage{ulem}
\usepackage{textcomp}
\usepackage{tikz}
%\usepackage{appendixnumberbeamer} %fix appendix
\usepackage{subfig} %Figures side by side (subfigures)
\usepackage{eurosym} %Eurosymbol

\usepackage{pgfplots, pgfplotstable,booktabs}
%\usepackage{pgfplots}
\usetikzlibrary{positioning}
\usepgfplotslibrary{dateplot}

\usepackage{listings}

\usepackage{epigraph}
\setlength{\epigraphwidth}{.8\textwidth}

\usepackage{DejaVuSansMono}

% Adjust the colours to fit your design
\definecolor{mainthemecolour}{rgb}{0.42,0.48,0.37}
\definecolor{mainthemecolourlight}{rgb}{0.63,0.72,0.57}
\definecolor{mainthemecolourstrong}{rgb}{0.40,0.68,0.18}
\definecolor{mid-gray}{gray}{0.7}

\definecolor{greenstrong}{rgb}{0.58,0.77,0.29}
\definecolor{redstrong}{rgb}{0.81,0.22,0.23}
\definecolor{fglisting}{gray}{0.3}
\definecolor{bglisting}{gray}{1}
\definecolor{fgshell}{gray}{1}
\definecolor{bgshell}{gray}{0.1}
\definecolor{bgshelllight}{gray}{0.8}


% Some in-code macros - a bit buggy, but useful
\newcommand{\hl}[1]{\textcolor{greenstrong}{\texttt{#1}}}
\newcommand{\hlErr}[1]{\textcolor{redstrong}{\texttt{#1}}}
\newcommand{\hlOk}[1]{\textcolor{green}{\texttt{#1}}}
\newcommand{\hlInv}[1]{\colorbox{bgshell}{\textcolor{fgshell}{\texttt{#1}}}}

\newcommand{\unhl}[1]{\textcolor{gray}{#1}}
\newcommand{\clda}[0]{$\textcolor{blue}{\lambda}$}
\newcommand{\carr}[0]{$\textcolor{purple}{\rightarrow}$}
\newcommand{\cbind}[0]{\textbf{\texttt{$>\!\!>\!\!=$}}}
\newcommand{\codedots}[0]{\textcolor{mid-gray}{...}}

\usetheme{elegance}

\lstnewenvironment{cxxcode}
    {\lstset
        { escapeinside={@}{@}
        , gobble=8
        , showstringspaces=false
        , basicstyle=\color{fglisting}
        , rulecolor=\color{mainthemecolourlight}
        }
    }
    {}

\lstnewenvironment{cxxcodebox}
    {\lstset
        { escapeinside={@}{@}
        , gobble=6
        , showstringspaces=false
        , basicstyle=\color{fglisting}
        , frame=lr
        , rulecolor=\color{mainthemecolourlight}
        }
    }
    {}

\lstnewenvironment{shellcode}
    {\lstset
        { escapeinside={@}{@}
        , gobble=7
        , showstringspaces=false
        , basicstyle=\color{fgshell}
        , backgroundcolor=\color{bgshell}
        }
    }
    {}


% Marking points to use in Tikz
\usetikzlibrary{arrows,shapes}
\newcommand{\tikzmark}[1]{\tikz[remember picture] \node[coordinate] (#1) {#1};}

% Fragile frames
\newenvironment{xframe}[1][]
  {\begin{frame}[fragile,environment=xframe,#1]}
  {\end{frame}}




% Code Listings

\definecolor{mygreen}{rgb}{0,0.6,0}
\definecolor{mygray}{rgb}{0.5,0.5,0.5}
\definecolor{mymauve}{rgb}{0.58,0,0.82}

\lstset{ 
	backgroundcolor=\color{white},   % choose the background color; you must add \usepackage{color} or \usepackage{xcolor}; should come as last argument
	basicstyle=\footnotesize,        % the size of the fonts that are used for the code
	breakatwhitespace=false,         % sets if automatic breaks should only happen at whitespace
	breaklines=true,                 % sets automatic line breaking
	captionpos=b,                    % sets the caption-position to bottom
	commentstyle=\color{mygreen},    % comment style
	deletekeywords={...},            % if you want to delete keywords from the given language
	escapeinside={\%*}{*)},          % if you want to add LaTeX within your code
	extendedchars=true,              % lets you use non-ASCII characters; for 8-bits encodings only, does not work with UTF-8
	frame=single,	                   % adds a frame around the code
	keepspaces=true,                 % keeps spaces in text, useful for keeping indentation of code (possibly needs columns=flexible)
	keywordstyle=\color{blue},       % keyword style
	language=bash,                 % the language of the code
	morekeywords={*,...},            % if you want to add more keywords to the set
	numbers=none,                    % where to put the line-numbers; possible values are (none, left, right)
	numbersep=5pt,                   % how far the line-numbers are from the code
	numberstyle=\tiny\color{mygray}, % the style that is used for the line-numbers
	rulecolor=\color{black},         % if not set, the frame-color may be changed on line-breaks within not-black text (e.g. comments (green here))
	showspaces=false,                % show spaces everywhere adding particular underscores; it overrides 'showstringspaces'
	showstringspaces=false,          % underline spaces within strings only
	showtabs=false,                  % show tabs within strings adding particular underscores
	stepnumber=2,                    % the step between two line-numbers. If it's 1, each line will be numbered
	stringstyle=\color{mymauve},     % string literal style
	tabsize=2,	                   % sets default tabsize to 2 spaces
	%title=\lstname                   % show the filename of files included with \lstinputlisting; also try caption instead of title
}