1 \usepackage{xcolor}

     2 \usepackage{fontspec}

     3 \usepackage[sc]{mathpazo}

     4 \usepackage{fontspec}

     5 \setmainfont[Ligatures=TeX]{Palatino Linotype}

     6 \usepackage{amssymb}

     7 \usepackage{amsmath}

     8 \usepackage{menukeys}

     9 \definecolor{darkblue}{rgb}{0,0,0.6}

    10 \usepackage[colorlinks=true,urlcolor=darkblue,linkcolor=darkblue]{hyperref}

    11 

    12 \newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}%

    13 \definecolor{codegray}{gray}{0.9}