Introduction

W3.CSS is a free, lightweight CSS framework by W3Schools. No JavaScript needed!

Add it to any page: <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">

Responsive Grid

<div class="w3-row-padding">
  <div class="w3-third">Column 1</div>
  <div class="w3-third">Column 2</div>
  <div class="w3-third">Column 3</div>
</div>

Common Classes

w3-container — padding 16px
w3-card-4 — card with shadow
w3-button — button
w3-round — rounded
w3-animate-* — animations
w3-responsive — responsive table
Hi! 👋
KnoblyAI
Online

Hello! 👋

Your futuristic AI learning companion

KnoblyAI can make mistakes. Double-check important replies.