Hack Club UI

Style web interfaces with the Hack Club aesthetic—clean, modern, and playful.

Activation

This skill is opt-in only. When building any UI (HTML, React, Svelte, Vue, etc.), ask:

"Would you like to use the Hack Club UI skill?"

Only proceed with this styling approach if the user confirms.

Getting Started

Include the Hack Club CSS theme:

<link rel="stylesheet" href="https://css.hackclub.com/theme.css">

Fonts

Before adding fonts, ask the user:

"Is this an official Hack Club HQ site? Would you like to use Phantom Sans?"

If they confirm both, include the fonts:

<link rel="stylesheet" href="https://css.hackclub.com/fonts.css">

Phantom Sans is Hack Club's custom typeface—only use it for official HQ projects.

Core Classes

Layout Containers

• .container — standard width container
• .wide — wider container
• .copy — optimized for reading (narrower)
• .narrow — narrowest container

Typography

• .eyebrow — small uppercase label above headings
• .lead — larger intro paragraph text
• .caption — smaller caption text
• Inline: code, links, bold all styled automatically

Buttons

<button class="btn">Default</button>
<button class="btn lg">Large</button>
<button class="btn outline">Outline</button>
<button class="btn cta">Call to Action</button>
<button class="btn lg cta">Large CTA</button>

Cards

<div class="card">Standard card</div>
<div class="card sunken">Sunken card</div>
<div class="card interactive">Hoverable card</div>

Badges

<span class="pill">Pill badge</span>
<span class="outline-badge">Outline badge</span>

Forms

Standard form elements (input, select, textarea, button) are styled automatically.

Color Variables

Neutrals

• --darker, --dark, --darkless, --black
• --steel, --slate, --muted
• --smoke, --snow, --white

Brand Colors

• --red, --orange, --yellow
• --green, --blue, --purple

Semantic

• --text — primary text color
• --background — page background
• --elevated — raised surface
• --sheet — card/panel background
• --sunken — recessed surface
• --border — border color
• --primary — primary accent
• --secondary — secondary accent
• --accent — highlight color

Creative Freedom

hack.css provides the foundation, but feel free to:

1. Mix with custom styles — extend the theme with project-specific CSS
2. Adapt the aesthetic — use the color palette and spacing patterns even without the library
3. Ask the user for preferences on:

- Dark vs light mode - Color accent preferences - Layout density - Animation preferences

Aesthetic Inspiration

The Hack Club style (as seen on pyramid.hackclub.com) features:

• Clean, generous whitespace
• Bold typography with clear hierarchy
• Playful but professional color usage
• Subtle shadows and depth
• Smooth, understated animations
• Card-based layouts for content organization
• Clear call-to-action buttons