CodeSandbox — decoded design system

codesandbox.io · dark · modern · custom · deep decode — measured live

CodeSandbox's design system, decoded live by Mozaika: measured color roles, type scale, buttons with real hover/focus states, motion and the brand's own tokens.

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This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/decode/codesandbox.io.

Decoded design system

CodeSandbox's decoded design system: background #0E0E0E, text #F0F0F0, accent #EAFF96, link #858585, primary #EAFF96; type scale h1 96px / h2 88px / body 18px; 8px spacing base; 4px base radius. The single interactive/action color is #EAFF96 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #EAFF96 — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent, button_bg are all #EAFF96 — one role, not several (the action color).
• accent #EAFF96 — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
• link #858585 — reads as a neutral UI color, not a link accent — verify against the reference (action = #EAFF96).

Typography

• Heading: Inter
• Body: Inter
• h1: 96px
• h2: 88px
• body: 18px

Spacing

• base unit: 8px
• scale: 4px, 7px, 8px, 10px, 12px, 13px, 16px, 24px, 32px, 48px

Radii

• base: 4px
• button: 4px

Shadows (elevation)

• card: rgba(0, 0, 2, 0.3) 0px 10px 30px 0px

Motion

Micro-interactions run at 150ms (dominant) with ease.

• durations: 150ms · 1000ms · 2000ms
• easings: ease · ease-in-out
• animated properties: opacity, color, background-color, border-color

Native design tokens

…and 110 more measured on the page.

Button states (measured)

• primary hover: background #F5FFCB
• primary focus: outline 2px solid rgb(176, 160, 255)

Layout (measured)

• container max-width: 1200px
• nav: 48px relative
• common grid: 4 columns

Motion choreography (measured)

Load order: div.cm--box → div.cm--box → div.cm--box → div.rfm-marquee×12 → span.c-PJLV×24 → span.c-PJLV×24

Overlay recipe (measured)

dialog panel: #333333 · radius 5px

Responsive (measured)

• breakpoints: 420px · 640px · 734px · 1068px · 1441px
• mobile (390px): hero 48px · nav inline

Install it

Drop this measured system into any shadcn/Tailwind project in one command:

npx shadcn add mozaika.design/r/decode/codesandbox.io

registry item · or query it over MCP: get_design_system("CodeSandbox")

Export: DESIGN.md

# CodeSandbox — Design System

> dark, modern, high, custom — deep decode (measured live)

## Colors

| Role | Value |
|------|-------|
| bg | `#0E0E0E` |
| surface | `#1B1B1B` |
| border | `#2F2F2F` |
| text | `#F0F0F0` |
| text_muted | `#9A9A9A` |
| primary | `#EAFF96` |
| accent | `#EAFF96` |
| link | `#858585` |
| button_bg | `#EAFF96` |
| button_text | `#343434` |

**Using these colors**

- **Action color** `#EAFF96` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `primary`, `accent`, `button_bg` are all `#EAFF96` — one role, not several (your action color).
- **accent** `#EAFF96` — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
- **link** `#858585` — reads as a neutral UI color, not a link accent — verify against the reference (action = #EAFF96).
- **Page coverage** (full-page screenshot pixels): `#161616` 68.3% · `#F4FFC2` 10.2% · `#2E2E2E` 9% · `#D9EB92` 7.7%

## Typography

- Heading: **Inter**
- Body: **Inter**

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 96px / 500 · lh 96px · tracking -4.8px |
| h2 | 88px / 500 · lh 88px · tracking -4.4px |
| h3 | 56px / 500 · lh 56px · tracking -2.8px |
| body | 18px / 400 · lh 25px · tracking -0.45px |
| small | 17px / 600 · lh 19px |

- Weight ladder: 200 · 400 · 500 · 600 — use these exact measured weights, not the 400/600 defaults.

> **Fonts —** Inter — free, on Google.

## Spacing
- base unit: 8px (inferred from the measured scale)
- measured scale: 4px, 7px, 8px, 10px, 12px, 13px, 16px, 24px, 32px, 48px — snap all gaps/padding to these
- section rhythm: 128px top/bottom padding per section (measured)

## Radius
- base: 4px
- button: 4px
- card: 10px
- pill: 9999px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#EAFF96` / `#343434` | none | 4px | 8px 12px 8px 12px | 500 12px | none |
| secondary | `#333333` / `#E5E5E5` | 1px solid rgb(82, 82, 82) | 4px | 6.56px 23.616px 6.56px 23.616px | 600 13.12px | none |

**States (measured, not guessed)**

- primary hover: background `#F5FFCB`
- primary focus: outline `2px solid rgb(176, 160, 255)`
- secondary hover: background `rgba(255, 255, 255, 0.1)`
- transition: `background-color 0.3s ease`

## Shadows (elevation)
- card: `rgba(0, 0, 2, 0.3) 0px 10px 30px 0px`

## Motion
- durations: 150ms (dominant) · 1000ms · 2000ms
- easings: `ease` (dominant) · `ease-in-out`
- animated properties: opacity, color, background-color, border-color

Micro-interactions use the dominant duration + easing; nothing on the page animates slower than the longest duration above — don't invent springier motion.

## Their own tokens (verbatim from :root)

| Token | Value |
|-------|-------|
| `--cc-link-color` | `#30363c` |
| `--cc-bg` | `#fff` |
| `--cc-primary-color` | `#2c2f31` |
| `--cc-secondary-color` | `#5e6266` |
| `--cc-btn-primary-bg` | `#30363c` |
| `--cc-btn-primary-color` | `#fff` |
| `--cc-btn-primary-border-color` | `#30363c` |
| `--cc-btn-primary-hover-bg` | `#000` |
| `--cc-btn-primary-hover-color` | `#fff` |
| `--cc-btn-primary-hover-border-color` | `#000` |
| `--cc-btn-secondary-bg` | `#eaeff2` |
| `--cc-btn-secondary-color` | `#2c2f31` |

_…and 108 more measured on the page._

Prefer these names when extending their system — it's the brand's actual vocabulary.

## Layout (measured)
- container max 1200px · common grid: 4-col
- nav: 48px relative

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 901 | 1130 | 6 | — | 128/128 | — |
| 2031 | 820 | 4 | — | 128/128 | — |
| 4144 | 248 | 4 | — | 0/0 | — |
| 4392 | 769 | — | — | 80/0 | — |

## Motion choreography (measured)
Load order: `div.cm--box` @0ms → `div.cm--box` @0ms → `div.cm--box` @0ms → `div.rfm-marquee`×12 @79ms → `span.c-PJLV`×24 @210ms → `span.c-PJLV`×24 @210ms
- overlay dialog (auto-opened): panel #333333 · r 5px · shadow rgba(0, 0, 2, 0.3) 0px 10px 30px 0px

Rebuild the timeline, not just the durations — order, delays and staggers above are the choreography.

## Components (measured)
- link: #CCCCCC · no underline — hover #FFFFFF

## Responsive (measured)
- breakpoints: 420px · 640px · 734px · 1068px · 1441px
- mobile (390px): hero 48px · body 16px · nav: inline

## How to apply
Paste the Tailwind `@theme` (or CSS variables) as your base, then build each
section to its spec — verify every color, radius, and font against these tokens.
Hover/focus states, shadows and motion timings above are measured from the live page — match them exactly, don't re-guess them.

← All decoded design systems

An automated reading of CodeSandbox's publicly-visible CSS (colors, fonts, spacing, motion) — not affiliated with codesandbox.io. No screenshots stored. Removal requests: hello@mozaika.design.