\documentclass{article}

\usepackage{mkessler-mathfig}

\begin{document}
    test
\[
    \begin{tikzcd}
        A \ar{r} &  B
    \end{tikzcd}
\]
test2:

    \begin{tikzcd}
        A \pushout & B \\
        C & D
    \end{tikzcd}

    \begin{tikzcd}
        A \pullback & B \\
        C & D
    \end{tikzcd}
\end{document}