Master dual colour schemes, CSS custom properties, and accessible theme toggling for modern Hong Kong websites with bilingual support
Start by creating two complete colour schemes — one for light mode, one for dark. Ensure both maintain your brand identity while meeting WCAG contrast ratios. Test readability across both English and Chinese typography for consistency.
Use CSS variables to store all colour values in your root selector. This approach lets you switch entire themes with a single class change. Group variables logically: backgrounds, text, borders, accents. Keep them descriptive and easy to maintain across updates.
Implement the prefers-color-scheme media query to respect user system settings automatically. This provides the best out-of-box experience. Combine it with localStorage to remember manual toggle choices, so users don’t reset their preference on every visit.
Learn how to design light and dark themes that feel intentional, not like an afterthought. Includes specific techniques for maintaining brand consistency across both modes while respecting readability standards.
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Organize all your theme colours using CSS variables. We’ll show you the structure that scales well and makes theme switching simple — even when you add new colours later.
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Detect and respect your users’ system colour preferences automatically. This guide covers the media query syntax, browser support, and how to combine it with manual toggle controls for the best experience.
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Don’t guess on readability. Learn which tools actually work for testing WCAG contrast ratios in both themes, plus specific techniques for bilingual English and Chinese content that needs special handling.
View TutorialDark mode reduces blue light exposure, making extended browsing more comfortable — especially important for users spending hours on content sites and web applications.
OLED and modern smartphone screens consume less power displaying dark colours. Users appreciate the battery savings, which improves their overall experience with your site.
Offering both themes serves users with light sensitivity, colour blindness, and various vision conditions. It’s a genuine accessibility win, not just a design trend.
Hong Kong users expect modern websites to support dark mode. Not offering it signals outdated development practices, while smooth theme switching builds trust and professionalism.
