Complete Dark Mode Implementation
This demo showcases a complete dark mode implementation with CSS variables, smooth transitions, and localStorage persistence. Toggle the switch in the header to see all elements transition seamlessly between light and dark themes.
💡 Note: This implementation respects the prefers-color-scheme media query, automatically defaulting to your system preference. The theme choice is saved to localStorage for persistence across sessions.
Feature Highlights
- CSS Custom Properties (Variables) for complete theme control
- Smooth 0.3s transitions on all themed elements
- Respects system preference via prefers-color-scheme
- localStorage persistence (theme saved automatically)
- Accessible toggle switch with visual feedback
- All components themed consistently
- Shadow and border color transitions
- Form elements fully themed
Content Cards
Design System
A comprehensive design system with consistent colors, spacing, and typography across light and dark modes.
UI/UX
Performance
Optimized transitions using CSS variables ensure smooth theme switching with minimal performance impact.
Optimization
Accessibility
High contrast ratios and proper color choices ensure readability in both themes for all users.
A11y
Persistence
Theme preference is saved to localStorage, maintaining user choice across browser sessions.
Storage
CSS Variables
:root {
--bg-primary: #ffffff;
--bg-secondary: #f5f5f5;
--text-primary: #1a1a1a;
--text-secondary: #666666;
--accent: #3b82f6;
--border: #e5e5e5;
--shadow: rgba(0, 0, 0, 0.1);
}
[data-theme="dark"] {
--bg-primary: #0f172a;
--bg-secondary: #1e293b;
--text-primary: #f1f5f9;
--text-secondary: #94a3b8;
--accent: #60a5fa;
--border: #334155;
--shadow: rgba(0, 0, 0, 0.3);
}
Data Table
| Property |
Light Mode |
Dark Mode |
| Background |
#ffffff |
#0f172a |
| Text |
#1a1a1a |
#f1f5f9 |
| Accent |
#3b82f6 |
#60a5fa |
| Border |
#e5e5e5 |
#334155 |
✅ Success! Dark mode is now fully functional with localStorage persistence enabled. Your theme preference will be remembered!