Feature request: separate option to set the css file used when exporting.

[sandyowlet]

I hope to add a separate option to set the css file used when exporting.

for example:
In this version of the extension, if I want to change the style of the exported file, I have to set the markdown preview style to use a css file.
But sometimes the color that looks clear under the default dark theme will look blurry under the exported default light theme.
Especially I like to edit in dark theme, but work requires me to export to light mode. Therefore, I must set the custom css to take effect when exporting, and switch back to the default style after exporting.

As shown in the next picture:

Nice colors in dark theme.

This color is very harsh in the exported file.

So in this case, I want to apply my custom css only on output, and use vscode's default style on preview.

[sandyowlet]

I found a solution to my problem, using the settings @media screen/print to set the format when exporting to html and pdf