Dark Mode example 21

What this example teaches

Dark Mode

Output

pricing section becomes easier to scan, align and resize without rewriting the markup.

Line-by-line explanation

• Line 1 sets up the Dark Mode example: :root { --surface: #ffffff; --text: #0f172a; }.
• Line 2 adds one required part of the working pattern: [data-theme="dark"] { --surface: #111827; --text: #f8fafc; }.
• Line 3 adds one required part of the working pattern: .panel { background: var(--surface); color: var(--text); }.

Why this example is useful

This example is useful because it isolates dark mode without surrounding noise, so you can see the idea clearly.

Where it is used in real projects

Dark Mode appears in real CSS work when a feature needs a clear pattern that can be reviewed and changed safely.

Beginner variation

Change one label, value or condition in the Dark Mode example and run it again.

Advanced variation

Combine Dark Mode with validation, error handling or reusable structure.