FandomizedPolls

FandomizedPolls adds a new style to polls. This stylesheet includes both a light theme and a dark theme.

Code
Add the following line in your wiki's Common.css. It must be added at the top of the page, otherwise, it won't work.

For Light Themes: For Dark Themes:

Alternatively, you can copy the contents either from MediaWiki:FandomizedPolls/light.css (for light themes) or MediaWiki:FandomizedPolls/dark.css (for dark themes).