\usepackage{fancyvrb}
\usepackage{color,amsmath,booktabs}
\usepackage[margin=3.5cm]{geometry}

\makeatletter
\renewcommand{\maketitle}{%
   \begin{flushleft}%
      \sffamily
      {\LARGE\bfseries\color{darkblue}\@title\par}%
      \medskip
      {\large\bfseries\@author\par}%
      \medskip
      {\textit{\@date}\par}%
      \bigskip\hrule\vspace*{1pc}%
   \end{flushleft}%
}
\makeatother

\usepackage{tcolorbox,xcolor}
\tcbuselibrary{skins,breakable}

\definecolor{darkblue}{rgb}{0, 0, 0.9}

\newcommand{\code}{\texttt}
\newcommand{\pkg}{\textsf}
\newcommand{\ape}{\pkg{ape}}
\newcommand{\phangorn}{\pkg{phangorn}}
\newcommand{\R}{\pkg{R}}

\newenvironment{Schunk}{\begin{tcolorbox}[breakable,colback=black!10,top=1mm,bottom=0mm,left=1mm,right=0mm,boxrule=.1mm]}{\end{tcolorbox}}

