Problem
In my previous post about LaTeX tables, I used \cellcolor{white} to
override the \rowcolor{cyan} in a cell in the leftmost column, which was the
column type name.
On Discord, that cell became black because TeXit inverted black and white.

Discussion
I first tried blending black and white, and I found that black!27 and
black!28 give a good approximation to Discord’s background color.
Thanks to this Discord Color Palette and a bot command channel on a server, I’ve observed that the desired color is RGB(54,57,62).
Solution
To use a RGB color in LaTeX, it’s better to use the packages color and
xcolor.
| option | range |
|---|---|
{RGB} |
⟦ 0,255 ⟧ |
{rgb} |
[0,1] |

The code for TeXit can be copied from the previous post, with the following adaptations:
\definecolor{mybg}{RGB}{54,57,62}: you may changemybgto any string. This line should appear before\begin{table}.\cellcolor{mybg}: use the previously defined color. Themybghere should match your custom name defined in (1).