Highlight formula terms

[wanjawischmeier]

• Highlight term parts used in kv diagram

\usepackage{tikz}
\newcommand{\highlightcolor}[2]{%
  \tikz[baseline=(X.base)]{%
    \node[fill=#1, rounded corners, inner sep=1pt] (X) {#2};%
  }%
}

\[ E = \highlightcolor{FF5733!30}{mc^2} \]

Originally posted by @wanjawischmeier in #75