W3.CSS ColorsLesson 59Free preview

W3.CSS Color Themes

This lesson is part of W3.CSS · All levels

Summary

The theme is a unified color system that can be applied simultaneously to many components, including light and dark variants. The most practical approach is to declare colors as CSS custom properties, and then change their values through a single theme class. Theme preferences can even be saved in the browser via localStorage.

Key points

The theme combines background colors, text, and accents into one system
Change the theme by changing the CSS variable value on the parent selector
The dark variants should maintain adequate text contrast.
Save user preferences in localStorage by JavaScript
Test each theme on buttons, cards, and long text

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