Wrong text color with jupytelab 4 in darkmode

[PicoCentauri]

With JupyterLab in the dark theme the text of the pop up panels is white even though the background color is white as well (see screenshot below). When using the light theme the text is correctly displayed in black.

I suggest that the background color of the pop ups should be changed to black when jupyter is used with the dark theme.

[Luthaf]

So what I think is happening here is that we are inheriting the text color from the root HTML, and jupyter changes that to white in dark mode.

The simplest fix would be to make sure we explicitly set text color to black/dark grey instead of inheriting the default.