<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\documentclass[tikz]{standalone}

\usetikzlibrary{matrix.skeleton}

\begin{document}
  \begin{tikzpicture}
    \matrix (m) [matrix of math nodes,
                 style odd rows on layer={background}{fill=black!25}] {
      1  &amp; \frac{\frac{16}{2}}{4}  &amp; 3  \\
      4.0000001  &amp; 5  &amp; 6  \\
      7  &amp; 8  &amp; 9  \\
      10 &amp; 11 &amp; 12 \\
      13 &amp; 14 &amp; 15 \\
    };
    \fitandstyle{(m-cell-1-1) (m-cell-2-2)}{draw=red, fill=red!25, opacity=0.5}
  \end{tikzpicture}
\end{document}
</pre></body></html>