styles - how to change font color in wiki on github -

i can't change font color in wiki on github.
<div style="color: red">test</div>
<font color="red">test</font>

unfortunetly, cannot include style directives in gfm.

here complete "markdown cheatsheet", , shows element <style> missing.

that being said, can use diff code style highlighting red , green:

```diff + highlighted in green - highlighted in red ```