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CSS Variables & Modern Features - Concepts

Explore the key concepts of css variables & modern features with practical examples and exercises.

45 min•By Priygop Team•Last updated: Feb 2026

Introduction to CSS Variables & Modern Features

In this section, we cover the fundamental aspects of css variables & modern features. You'll learn core concepts, see real-world examples, and understand how to apply them in your projects.

Key Concepts

Understanding the core principles of css variables & modern features
Practical applications and real-world use cases
Step-by-step implementation guides
Common patterns and best practices
Tips for debugging and troubleshooting
Performance optimization techniques

CSS Variables & Modern Features - Code Example

Example

<style>
:root {
  --primary: #667eea;
  --secondary: #764ba2;
  --text: #333;
  --bg: #fff;
  --radius: 8px;
  --shadow: 0 4px 15px rgba(0,0,0,0.1);
}
[data-theme="dark"] {
  --primary: #a78bfa;
  --text: #f0f0f0;
  --bg: #1a1a2e;
}
.card {
  background: var(--bg);
  color: var(--text);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.btn { background: var(--primary); color: white; border: none; padding: 10px 20px; border-radius: var(--radius); }
</style>

Try It Yourself: CSS Variables & Modern Features

Try It Yourself: CSS Variables & Modern FeaturesCSS

CSS Editor

✓ ValidTab = 2 spaces

<style>
: root {
  #9cdcfe">--primary: #667eea;
  #9cdcfe">--bg: #f8f9fa;
  #9cdcfe">--card-bg: white;
  #9cdcfe">--text: #333;
}
.dark{ #9cdcfe">--primary: #a78bfa; #9cdcfe">--bg: #1a1a2e; #9cdcfe">--card-bg: #2d2d44; #9cdcfe">--text: #eee; }
body{ #9cdcfe">background: var(--bg); #9cdcfe">color: var(--text); #9cdcfe">font-family: sans-serif; #9cdcfe">padding: 20px; #9cdcfe">transition: all 0.3s; }
.card{ #9cdcfe">background: var(--card-bg); #9cdcfe">padding: 20px; #9cdcfe">border-radius: 12px; #9cdcfe">margin: 20px 0; #9cdcfe">box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
.btn{ #9cdcfe">background: var(--primary); #9cdcfe">color: white; #9cdcfe">border: none; #9cdcfe">padding: 10px 20px; #9cdcfe">border-radius: 8px; #9cdcfe">cursor: pointer; }
</style>
<button class="btn" onclick="document.body.classList.toggle('dark')">Toggle Dark Mode</button>
<div class="card">
  <h2>CSS Variables Demo</h2>
  <p>Click the button to toggle dark mode using CSS custom properties!</p>
</div>

Result

Click ▶ Run to see the result

Edit the code on the left, then click Run

CSS|17 lines|772 chars|✓ Valid syntax

UTF-8

Quick Quiz: CSS Variables & Modern Features

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