CSS Variables

🎨 CSS3+ 🟢 Chapter 36 of 49 📂 Phase 13: Custom Properties & Themes 📅 2026 Edition

📌 Covered in this chapter: Custom Properties · Declaring · var() · Root Variables · Component Variables · Fallback · Inheritance · Dynamic Values · Naming · Debugging

Welcome to Chapter 36: CSS Variables — part of the CSS Complete Roadmap. This lesson covers all subtopics with clear explanations, code examples, and best practices used in professional web development.

1Custom Properties Ante Enti?

Custom properties ante enti? CSS variables — values store chesi reuse cheyochu. Preprocessor variables kante dynamic — runtime lo JavaScript tho change cheyochu.

CSS▶ Try in Editor

:root {
  --color-primary: #2563eb;
  --radius-md: 8px;
  --space-md: 16px;
}

.button {
  background: var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

2Fallback, Inheritance & Component Variables

CSS

.card {
  --card-padding: 24px;
  --card-bg: #ffffff;
  padding: var(--card-padding);
  background: var(--card-bg);
}

.alert {
  color: var(--alert-color, #dc2626); /* fallback if undefined */
}

Inheritance: Custom properties inherit like regular properties — child elements parent variables access cheyochu.

Naming: Semantic names (--color-primary) not presentational (--blue). BEM-style: --button-bg-hover.

Written by Our Compiler Technical Editorial Team
Reviewed for accuracy · CSS Complete Roadmap · Last updated August 2026