With the style guide export to Webflow, only the first page gets styled, and also no dark mode comes across either.
You only get to style the first page in Relume style guide, but that style gets applied to all of the pages you wireframed in Relume and import into Webflow.
With dark mode, you can't bring it across, but you can update one of the colour schemes in your variables panel to be your dark mode colours and just paste in all of the colours