Mathematics can be styled by CSS:
For example, here is small red text:
$\sqrt{\,1-{x\over 1+x}}$.
There are extensions like \color and \bbox to
make your mathematics more interesting:
$$
\color{red}{R} + \color{green}{G} + \color{blue}{B}
\qquad\hbox{or}\qquad
\int_0^1\bbox[3px,border:2px dashed green]{\,1+x^2\strut\,}\ dx
$$
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