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like so
``` - add language identifier to highlight code ```python
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lang-tex
\input opmac \ooalign{\S\cr \thefontscale[180]\hfil \raise2.4ex\hbox{B}\hfil\cr} \bye.\pdfliteral?!\ooalign{\S\cr \hfil \raise.43ex \hbox to0pt{\pdfliteral{q .2 0 0 .2 0 0 cm}\hss\bf B\hss\pdfliteral{Q}}\hfil\cr}