I setup the css style in the globle config file. It works in the preview and pdf export. However, the exported html has no style somehow.
Yes, because people usually export to HTML to put the HTML on some website, in which case pointing to some CSS file on local filesystem will make little sense.
Of course it can be embedded, but the whole ReText stylesheet (which sometimes contains docutils.css and/or pygments.css) can be quite huge.
In other words, I am not yet convinced.
You seem to have CSS turned off.
Please don't fill out this field.
Alright, I agree. Thanks!