A practical dark mode implementation for content sites
Theme toggles are table stakes — here's how to implement dark mode without flash, contrast issues, or maintenance pain.
Dark mode isn’t a filter slapped on light styles. It’s a token system.
Define semantic colors
Use variables like --color-surface and --color-foreground instead of hard-coded hex values in components. Tailwind can map utilities to those tokens, which keeps Astro components clean.
Prevent flash on load
An inline script in the document head can read localStorage and system preference before paint. Launchfolio applies the dark class immediately to avoid a jarring flash.
Test contrast in both themes
Badges, borders, and muted text often fail WCAG in dark mode even when light mode looks fine. Check focus rings and form inputs specifically.
Document for buyers
Premium themes should explain where tokens live and how to adjust accent colors. A style guide page makes support easier and increases perceived product value.
Dark mode done well feels invisible. Done poorly, it erodes trust.
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