Adding Color

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Here is a good reference list of the pre-defined HTML colors: https://developer.mozilla.org/en-US/docs/Web/CSS/named-color

Within an equation context, KateX supports colored equation text and backgrounds with the \textcolor{color}{text} and \colorbox{color}{content} functions.

\[\textcolor{tomato}{this + equation / is = tomato}\] \[\fcolorbox{aqua}{cadetblue}{Surrounded by a box. Enter math-mode with dollar signs $like + this$}\]