Set your Publisher ID in src/config/ads.ts to display live ads.
Containers, Panels & Cards
w3-container, w3-panel, and shadow-elevated w3-card classes
Structural content boxing in W3.CSS revolves around w3-container for standard padding, w3-panel for alert margins, and w3-card for material-style elevations.
Box Containers in W3.CSS
w3-container: Adds standard 16px left and right padding to any HTML element. Ideal for headers, footers, sections, and div wrappers.
w3-panel: Similar to w3-container with 16px padding, but also adds 16px top and bottom margin. Ideal for callout alerts and banner notifications.
w3-card-2 and w3-card-4: Adds subtle or deep material drop shadows to create elevated card components.
<div class="w3-card-4 w3-margin" style="max-width: 380px;">
<header class="w3-container w3-blue">
<h3>Pro Plan Subscription</h3>
</header>
<div class="w3-container w3-padding-16">
<p>Unlock 50+ programming tracks and verifiable digital certificates.</p>
<button class="w3-button w3-block w3-green w3-round">Get Started</button>
</div>
</div>Set your Publisher ID in src/config/ads.ts to display live ads.
Test Yourself With Exercise
Which class in W3.CSS adds 16px horizontal padding AND 16px vertical margins, perfect for alert banners?