Dark Mode Design: Implementing Theme Switching on Your Website

Dark mode has moved from a trendy feature to a user expectation. Most operating systems and major apps support it, and users expect websites to follow suit.

Why Dark Mode Matters

• User preference: 81.9% of smartphone users enable dark mode
• Eye comfort: Reduces eye strain in low-light environments
• Battery savings: Dark pixels use less energy on OLED screens
• Modern perception: Dark mode signals a technically current website

Implementation Approaches

CSS Custom Properties (Recommended)

Use CSS variables for all colors, then switch the variable values based on theme. This is the cleanest approach -- one change affects the entire site.

Respecting System Preferences

The prefers-color-scheme media query detects the user operating system preference. Use this as the default, then allow manual override with a toggle button.

Persistent User Choice

Save the user theme preference in localStorage so it persists across visits. Apply the saved theme before the page renders to prevent a flash of the wrong theme.

Dark Mode Design Tips

• Do not just invert colors: Pure white text on pure black backgrounds causes halation. Use off-white (#E0E0E0) on dark gray (#1A1A1A).
• Reduce contrast slightly: High contrast causes more eye strain in dark mode, not less.
• Test images and logos: Some images look wrong on dark backgrounds. Provide dark-mode variants where needed.
• Adjust shadows: Drop shadows do not work on dark backgrounds. Use lighter borders or elevation changes instead.

AppWT implements dark mode as part of modern web design. Our sites respect user preferences while maintaining brand consistency across both themes. Discuss your design project.