---
version: alpha
name: GitHub
description: Light design system extracted from github.com (DOM-true values, Emblematic extractor 0.2.0, 2026-11-12).
colors:
  background: "#FFFFFF"
  surface: "#F2F5F3"
  primary: "#08872B"
  on-surface: "#000000"
  on-surface-variant: "#58635B"
  outline: "#D2D9D4"
  brand-color-border-muted: "#E4EBE6"
  base-color-scale-blue-3: "#5FB9FF"
  brand-token-bgcolor-hover-outline: "#0000000F"
  base-color-scale-pink-3: "#FF80D2"
  base-color-scale-orange-4: "#DA7210"
  brand-icon-color-indigo: "#4956E5"
  brand-color-neutral-emphasisplus: "#353D37"
  base-color-scale-blue-2: "#8DD6FF"
typography:
  display-lg:
    fontFamily: Mona Sans
    fontSize: 56px
    fontWeight: 440
    lineHeight: 1.1
  headline-md:
    fontFamily: Mona Sans
    fontSize: 34px
    fontWeight: 400
    lineHeight: 1.3
  title-md:
    fontFamily: Mona Sans
    fontSize: 20px
    fontWeight: 400
    lineHeight: 1.3
  body-md:
    fontFamily: Mona Sans
    fontSize: 18px
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: 0.01em
  body-sm:
    fontFamily: Mona Sans
    fontSize: 14px
    fontWeight: 500
    lineHeight: 1.5
    letterSpacing: 0.015em
  label-md:
    fontFamily: Mona Sans Mono
    fontSize: 12px
    fontWeight: 500
    lineHeight: 1.5
  mono-md:
    fontFamily: Mona Sans Mono
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: 0.015em
rounded:
  sm: 4px
  md: 6px
  lg: 8px
  full: 9999px
spacing:
  xxs: 2px
  xs: 4px
  sm: 6px
  md: 8px
  lg: 12px
  xl: 16px
  2xl: 20px
  3xl: 24px
  4xl: 32px
  5xl: 48px
  6xl: 59px
  7xl: 60px
  8xl: 64px
  9xl: 80px
  base: 4px
  container: 1184px
components:
  button-primary:
    backgroundColor: "{colors.on-surface}"
    textColor: "{colors.background}"
    rounded: "{rounded.md}"
    padding: 0px
    height: 32px
    typography: "{typography.label-md}"
  button-secondary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.background}"
    rounded: "{rounded.md}"
    padding: 6px
    height: 43px
    typography: "{typography.label-md}"
  card:
    rounded: "{rounded.md}"
    padding: 0px
  input:
    rounded: "{rounded.lg}"
    padding: 16px
    height: 41px
---

# GitHub

> Extracted from [https://github.com/](https://github.com/) on 2026-11-12 by Emblematic. Every value below was read from the rendered DOM (computed styles, `document.fonts`, and the fonts Chrome actually used to paint text), not estimated from pixels. When the YAML front matter and this prose disagree, the YAML wins. Copy values from this file exactly; don't transcribe them from memory. Don't copy logos, imagery, illustrations or marketing copy.

## Overview

GitHub uses a light canvas (#FFFFFF) with a palette led by #08872B. Type is set in **Mona Sans** (display + body), **Mona Sans Mono** (mono), with 18px body text. Layout: 1184px container, top-static navigation, 8 sections. Built with hotwire, contentful, github-pages.

## Colors

Area-weighted from painted backgrounds, text and borders on the 1440px light capture. Roles are inferred from usage (largest background, most text, interactive fills). Every hex is an exact computed value; a role marked *unverified* is a best guess that has not passed review, so its canonical token (e.g. `primary`) is left out of the front matter.

| Token | Hex | OKLCH | Role | Share of paint | CSS variable |
|---|---|---|---|---|---|
| `background` | `#FFFFFF` | 1 0 0 | bg | 64.6% | `--card-bgColor` |
| `surface` | `#F2F5F3` | 0.967 0.004 157.2 | surface | 16.4% | `--brand-CTABanner-bgColor` |
| `primary` | `#08872B` | 0.543 0.163 146 | accent | 5.9% | `--brand-color-success-fg` |
| `on-surface` | `#000000` | 0 0 0 | text | 5.0% | `--brand-color-text-default` |
| `on-surface-variant` | `#58635B` | 0.488 0.019 154.1 | muted | 1.5% | `--brand-Spinner-fgColor` |
| `outline` | `#D2D9D4` | 0.878 0.01 155.1 | border | 0.47% | `--brand-color-border-subtle` |
| `brand-color-border-muted` | `#E4EBE6` | 0.933 0.01 155.1 | other | 1.4% | `--brand-color-border-muted` |
| `base-color-scale-blue-3` | `#5FB9FF` | 0.759 0.133 244.4 | other | 1.3% | `--base-color-scale-blue-3` |
| `brand-token-bgcolor-hover-outline` | `#0000000F` (on bg `#F0F0F0`) | 0 0 0 | other | 0.75% | `--brand-Token-bgColor-hover-outline` |
| `base-color-scale-pink-3` | `#FF80D2` | 0.768 0.18 342.7 | other | 0.56% | `--base-color-scale-pink-3` |
| `base-color-scale-orange-4` | `#DA7210` | 0.659 0.16 54.6 | other | 0.37% | `--base-color-scale-orange-4` |
| `brand-icon-color-indigo` | `#4956E5` | 0.532 0.214 272.7 | other | 0.37% | `--brand-Icon-color-indigo` |
| `brand-color-neutral-emphasisplus` | `#353D37` | 0.35 0.015 153.1 | other | 0.30% | `--brand-color-neutral-emphasisPlus` |
| `base-color-scale-blue-2` | `#8DD6FF` | 0.843 0.093 234 | other | 0.28% | `--base-color-scale-blue-2` |

Sparse chromatic highlights (not accents): `#23EA57` (`--base-color-scale-green-4`), `#C898FD` (`--base-color-scale-purple-2`), `#FD9FE2`.

Declared brand/accent tokens: `--brand-Link-color-accent` = `#0055D5`, `--bgColor-accent-emphasis` = `#0969DA`, `--brand-color-accent-primary` = `#0D6731`.

Contrast: text on background 21:1, muted text 6.27:1, accent 4.66:1.

Gradients in use: `url("https://github.githubassets.com/assets/tile-gradient-1-655dba6cdcef3c96.webp")`.

The site does not change under `prefers-color-scheme: dark`.

## Typography

| Family | Role | Weights | Share of text | Source |
|---|---|---|---|---|
| **Mona Sans** | display, body | 400, 440, 460, 480, 500 | 91.4% | webfont |
| **Mona Sans Mono** | mono | 400, 480, 500 | 8.4% | webfont |

Declared in `@font-face` but not used to paint text on this page: Hubot Sans. Don't treat these as the page's fonts.

Scale (px): 12, 14, 16, 18, 20, 22, 28, 32, 34, 40, 56. Effective ratio ≈ 1.176 (close to a minor third). Body 18px at line-height 1.5; display 56px with tracking 0em. Headings are sentence case. On a 390px viewport the body is 18px and display 36px.

## Layout

Spacing follows a 4px base unit; the most used steps are 2, 4, 6, 8, 12, 16, 20, 24, 32, 48, 59, 60, 64, 80px. Sections open with about 88px of space before their first line of text. Content sits in a 1184px container on a 12-column grid. Text density 0.061 (text area / page area).

Section order (desktop). Kinds below the review threshold are shown as *section*:

1. **nav** (68px, bg #FFFFFF)
2. **logos** (68px, bg #FFFFFF)
3. **hero** — “you with starts still Software” (1574px, bg #FFFFFF)
4. **section** — “GitHub Platform” (951px, bg #FFFFFF)
5. **section** — “More ways to use GitHub” (1385px, bg #FFFFFF)
6. **testimonials** — “Whatever you're building, you can build it on GitHub” (1867px, bg #FFFFFF)
7. **newsletter** — “Join the world's largest developer community” (757px, bg #FFFFFF)
8. **footer** — “Company” (1031px, bg #F2F5F3)

## Elevation & Depth

Style: flat. Most used shadows:

- `rgb(228, 235, 230) 0px -1px 0px 0px inset`

## Shapes

Dominant corner radius 0px; radii in use: 4px, 6px, 8px, pill. Borders: hairline (1px).

## Components

- **button-primary**: backgroundColor `#000000`, textColor `#FFFFFF`, rounded `6px`, padding `0px 12px`, height `32px`, fontFamily `Mona Sans VF`, fontSize `16px`, fontWeight `400`
- **button-secondary**: backgroundColor `#08872B`, textColor `#FFFFFF`, rounded `6px`, padding `6px 20px`, height `43px`, fontFamily `Mona Sans VF`, fontSize `14px`, fontWeight `400`
- **card**: rounded `6px`, padding `0px`, border `1px solid #D2D9D4`
- **input**: rounded `8px`, height `41px`, padding `16px 12px`

## Do's and Don'ts

- Do reserve `#08872B` for primary actions and highlights; it covers only 5.9% of the painted page.
- Do set body copy in Mona Sans at 18px / 1.5.
- Don't introduce font weights beyond 400, 440, 460, 480, 500.
- Don't add drop shadows; depth comes from tone and borders.
- Do keep corners at 0px for most controls, and use the larger radii only for cards and media.
- Do snap spacing to multiples of 4px.
- Don't copy this site's logos, illustrations, photography or copy; use the system, not the brand assets.

## Provenance

Spec v2, extractor 0.2.0. Render quality: **ok**. Vision pass: not run. Fields below confidence 0.7 are hedged or left out above: `color.accent_strategy`, `layout.columns`, `layout.hero`, `layout.section_count`, `space.section_padding_px`. Full per-field provenance is in `spec.json`.