\newcommand{\boxalert}[1]{{
    \usebeamercolor{alerted text}
    \colorbox{bg}{\alert{#1}}
}}

\newtcblisting{cisco}[1][]{
    size=fbox,
    listing only,
    listing options={
        style=tcblatex,
        basicstyle=\ttfamily\scriptsize,
        tabsize=1,
        language=sh,
        breaklines=false,
        columns=fullflexible
    },
    #1
}

\newcommand{\pic}[2]{
    \begin{center}
        \transparent{0.4}
        \includegraphics[height=#1]{#2}
    \end{center}
}