How To Reproduce
Utilise the configuration that is available within 'http://github.com/searxng/searxng/files/8208925/default.ZIP'. Specifically, enable 'browser.display.use_system_colors' and additional relevant functionality.

Expected behavior
The enablers of functionality are not visible.

Screenshots & Logs
Observe 'http://github.com/searxng/searxng/files/8208922/default.ZIP', whose constituents are available at 'http://imgur.com/a/CL7y6am'.
This was originally discussed at 'http://reddit.com/comments/t3dszc/comment/hzppi3m'.
Consider utilisation of check-boxes as replacement.