\documentclass[tikz]{standalone}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{oubraces}
\usepackage[customcolors]{hf-tikz}
\definecolor{docsrscolor}{HTML}{f5f5f5}

\newcommand{\myeqs}[1]{
    \Huge
    \begin{tikzpicture}
        \node[
            fill=docsrscolor,
            rounded corners=8mm,
            inner sep=8mm
        ]{$#1$};
    \end{tikzpicture}
}