DESIGN.md · measured October 21, 2026

Cosmos design system

Light monochrome interface measured from cosmos.so: cosmosOracle type, tonal surfaces and pill-shaped controls.

Background: #F7F5F3
Primary: #0D0D0D
Type: cosmosOracle
Corners: 16px

Download DESIGN.md

From cosmos.so ↗ · 354 elements at 1440×900 and 390×844 · Independent analysis, not affiliated with Cosmos

Cosmos colors

17 roles measured on the page, grouped by where each color is used.

Surfaces

Snow#F7F5F3backgroundPage background · 3×

Mist#F2F1F0surface-container-lowRaised areas one step from the page · 28×

Snow#FCFBFAsurface-containerCards and panels · 2×

White#FFFFFFsurface-container-highHover and pressed fills · 35×

Mist#E8E6E4surface-container-highestHighest raised elements · 1×

Near Black 2%#00000005overlayTranslucent fill for cards and controls · 7×

White 40%#FFFFFF66overlay-strongStronger translucent fill · 1×

Text

Charcoal#0D0D0Don-surfacePrimary text and headings · 32×

Slate#6E6A69on-surface-variantSecondary text · 9×

Gray#9A9796on-surface-mutedMuted text and metadata · 7×

White#FFFFFFon-primaryText and icons on primary

Accents

Charcoal#0D0D0DprimaryPrimary buttons and calls to action · 79×

Vivid Blue#4694F6secondaryAccent · 1×

Borders

Charcoal 12%#0D0D0D1FoutlineBorders and dividers · 18×

White#FFFFFFoutline-variantSecondary dividers · 11×

Status

Dark Red#A0213EerrorErrors and destructive states · 1×

Vivid Orange#EBB042warningWarnings and highlights · 1×

Cosmos fonts

One family carries the whole interface.

AacosmosOracleWeights 400, 500, 700cosmosOracle, cosmosOracle Fallback

headline-displayPage title (h1)Cosmos72px · 700 · 1 · -0.04em
mobile 32px

headline-lgSection headings (h2)The quick brown fox jumps over the lazy dog48px · 500 · 1 · -0.04em
mobile 32px

headline-mdSub-section headingsThe quick brown fox jumps over the lazy dog26px · 500 · 1.15 · -0.04em

headline-smCard and feature titlesThe quick brown fox jumps over the lazy dog20px · 500 · 1.15

body-mdBody textThe quick brown fox jumps over the lazy dog16px · 400 · 1.5

body-smSecondary and small textThe quick brown fox jumps over the lazy dog14px · 400 · 1.4

label-lgLarge buttons and tabsThe quick brown fox jumps over the lazy dog16px · 500 · 1.5 · -0.02em

label-mdButtons, navigation and labelsThe quick brown fox jumps over the lazy dog15px · 500 · 1.47 · -0.019em

label-smSmall labels and badgesThe quick brown fox jumps over the lazy dog14px · 500 · 1.43 · -0.02em

Contrast

Text on #F7F5F3

AaAAA17.9:1

AaAA4.9:1

AaLarge only2.7:1

Spacing

No strict grid · 83% are multiples of 4px

xs4px

sm8px

md16px

lg20px

gutter8px

margin32px

Breakpoints: 720px 768px

Shapes

Corner radii, most used first.

md16px · 56×

full9999px · 24×

sm12px · 4×

Depth

Shadow

Components

Rebuilt from the measured CSS.

button-primaryFilled button · hover to see the measured hover state

button-ghostText button

Card

cardCard

Inline link

linkInline link

Motion

Interface transitions

1e-05s

easecubic-bezier(0.4, 0, 0.2, 1)

Do’s and don’ts

Rules written from the measurements, so a coding agent stays on style.

Use #F7F5F3 for the page and lift surfaces in small steps: #F2F1F0, #FCFBFA, #FFFFFF, #E8E6E4.
Keep text in 3 levels: #0D0D0D, #6E6A69, #9A9796.
Let contrast carry emphasis; primary actions use #0D0D0D on #F7F5F3.
Set headlines in cosmosOracle with tight tracking (-0.04em).
Reuse the measured spacing steps (8px, 16px, 20px).
Make buttons and chips fully rounded (9999px); most other elements use 16px corners.
Use #9A9796 for body text; it reaches 2.7:1 on #F7F5F3. Keep it for large text or metadata.
Introduce new font families beyond cosmosOracle.
Add saturated accent colors; the measured palette is almost entirely neutral.
Make interface transitions slower than 0.00001s.

DESIGN.md221 lines

---
version: alpha
name: Cosmos
description: "Light monochrome interface measured from cosmos.so: cosmosOracle type, tonal surfaces and pill-shaped controls."
colors:
  background: "#F7F5F3"
  surface: "#F7F5F3"
  on-surface: "#0D0D0D"
  on-background: "#0D0D0D"
  on-surface-variant: "#6E6A69"
  on-surface-muted: "#9A9796"
  surface-container-low: "#F2F1F0"
  surface-container: "#FCFBFA"
  surface-container-high: "#FFFFFF"
  surface-container-highest: "#E8E6E4"
  overlay: "#00000005"
  overlay-strong: "#FFFFFF66"
  outline: "#0D0D0D1F"
  outline-variant: "#FFFFFF"
  primary: "#0D0D0D"
  on-primary: "#FFFFFF"
  secondary: "#4694F6"
  error: "#A0213E"
  warning: "#EBB042"
typography:
  headline-display:
    fontFamily: cosmosOracle
    fontSize: 72px
    fontWeight: 700
    lineHeight: 1
    letterSpacing: -0.04em
  headline-lg:
    fontFamily: cosmosOracle
    fontSize: 48px
    fontWeight: 500
    lineHeight: 1
    letterSpacing: -0.04em
  headline-md:
    fontFamily: cosmosOracle
    fontSize: 26px
    fontWeight: 500
    lineHeight: 1.15
    letterSpacing: -0.04em
  headline-sm:
    fontFamily: cosmosOracle
    fontSize: 20px
    fontWeight: 500
    lineHeight: 1.15
  body-md:
    fontFamily: cosmosOracle
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
  body-sm:
    fontFamily: cosmosOracle
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.4
  label-lg:
    fontFamily: cosmosOracle
    fontSize: 16px
    fontWeight: 500
    lineHeight: 1.5
    letterSpacing: -0.02em
  label-md:
    fontFamily: cosmosOracle
    fontSize: 15px
    fontWeight: 500
    lineHeight: 1.47
    letterSpacing: -0.019em
  label-sm:
    fontFamily: cosmosOracle
    fontSize: 14px
    fontWeight: 500
    lineHeight: 1.43
    letterSpacing: -0.02em
  headline-display-mobile:
    fontFamily: cosmosOracle
    fontSize: 32px
    fontWeight: 700
    lineHeight: 1
    letterSpacing: -0.04em
  headline-lg-mobile:
    fontFamily: cosmosOracle
    fontSize: 32px
    fontWeight: 500
    lineHeight: 1
    letterSpacing: -0.04em
rounded:
  sm: 12px
  md: 16px
  full: 9999px
spacing:
  xs: 4px
  sm: 8px
  md: 16px
  lg: 20px
  gutter: 8px
  margin: 32px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.on-primary}"
    typography: "{typography.label-md}"
    padding: 16px 24px
    height: 48px
  button-primary-hover:
    backgroundColor: "#232323"
  button-ghost:
    typography: "{typography.label-md}"
    padding: 16px 24px
  card:
    typography: "{typography.body-md}"
    padding: 0px 12px 0px 20px
  link:
    textColor: "#D0CDCD"
---

# Cosmos Design System

## Overview

Cosmos describes itself as: “Your space for inspiration” The interface is light, built on **Snow (#F7F5F3)** with **Charcoal (#0D0D0D)** text and almost no color: actions are carried by contrast, not hue.

Type is set in **cosmosOracle**. Headlines run large with tight negative tracking; body text is 16px. Depth comes from soft drop shadows. Controls are pill-shaped.

Measured from [cosmos.so](https://www.cosmos.so/) on October 21, 2026 at 1440×900 and 390×844 from 354 rendered elements. Values are computed styles from the live page, not the original source files.

## Colors

The palette has 17 roles.

- **Snow (#F7F5F3):** Page background, seen 3 times. Token `background`.
- **Charcoal (#0D0D0D):** Primary text and headings, seen 32 times. Token `on-surface`.
- **Slate (#6E6A69):** Secondary text, seen 9 times. Token `on-surface-variant`.
- **Gray (#9A9796):** Muted text and metadata, seen 7 times. Token `on-surface-muted`.
- **Mist (#F2F1F0):** Raised areas one step from the page, seen 28 times. Token `surface-container-low`.
- **Snow (#FCFBFA):** Cards and panels, seen 2 times. Token `surface-container`.
- **White (#FFFFFF):** Hover and pressed fills, seen 35 times. Token `surface-container-high`.
- **Mist (#E8E6E4):** Highest raised elements, seen 1 time. Token `surface-container-highest`.
- **Near Black 2% (#00000005):** Translucent fill for cards and controls, seen 7 times. Token `overlay`.
- **White 40% (#FFFFFF66):** Stronger translucent fill, seen 1 time. Token `overlay-strong`.
- **Charcoal 12% (#0D0D0D1F):** Borders and dividers, seen 18 times. Token `outline`.
- **White (#FFFFFF):** Secondary dividers, seen 11 times. Token `outline-variant`.
- **Charcoal (#0D0D0D):** Primary buttons and calls to action, seen 79 times. Token `primary`.
- **White (#FFFFFF):** Text and icons on primary. Token `on-primary`.
- **Vivid Blue (#4694F6):** Accent, seen 1 time. Token `secondary`.
- **Dark Red (#A0213E):** Errors and destructive states, seen 1 time. Token `error`.
- **Vivid Orange (#EBB042):** Warnings and highlights, seen 1 time. Token `warning`.

## Typography

**cosmosOracle** carries the whole interface. Fallback stack: `cosmosOracle, cosmosOracle Fallback`.

- **headline-display:** cosmosOracle 72px at weight 700, line height 1, tracking -0.04em (32px on mobile). Page title (h1).
- **headline-lg:** cosmosOracle 48px at weight 500, line height 1, tracking -0.04em (32px on mobile). Section headings (h2).
- **headline-md:** cosmosOracle 26px at weight 500, line height 1.15, tracking -0.04em. Sub-section headings.
- **headline-sm:** cosmosOracle 20px at weight 500, line height 1.15. Card and feature titles.
- **body-md:** cosmosOracle 16px at weight 400, line height 1.5. Body text.
- **body-sm:** cosmosOracle 14px at weight 400, line height 1.4. Secondary and small text.
- **label-lg:** cosmosOracle 16px at weight 500, line height 1.5, tracking -0.02em. Large buttons and tabs.
- **label-md:** cosmosOracle 15px at weight 500, line height 1.47, tracking -0.019em. Buttons, navigation and labels.
- **label-sm:** cosmosOracle 14px at weight 500, line height 1.43, tracking -0.02em. Small labels and badges.

## Layout

Spacing is mostly on a 4px grid (83% of measured values), with some off-grid steps. Match the measured scale rather than rounding everything.

- **Scale:** xs 4px, sm 8px, md 16px, lg 20px.
- **Gaps:** 8px is the most common gap in flex and grid layouts.
- **Page margin:** 32px on each side of full-width sections.
- **Breakpoints:** 720px, 768px.

## Elevation & Depth

Raised elements use soft drop shadows. The most used recipes:

- `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.05) 0px 1px 8px 0px`
- `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.05) 0px 3px 12px 0px`
- `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.02) 0px 2px 12px 0px, rgba(0, 0, 0, 0.1) 0px 4px 16px 0px`

## Shapes

Interactive controls are pill-shaped. Measured radii, most used first:

- **md (16px):** 56 elements.
- **full (9999px):** 24 elements.
- **sm (12px):** 4 elements.

## Components

Measured from the rendered page. Token values reference the tokens above.

- **button-primary (“Sign up”):** #0D0D0D fill, #FFFFFF text, 15px/500, 3.35544e+07px radius, padding 16px 24px.
- **button-primary-hover:** background #232323, text #FFFFFF on hover.
- **button-ghost (“Sign up”):** transparent fill, 15px/500, 3.35544e+07px radius, padding 16px 24px.
- **card:** transparent fill, 16px/400, 3.35544e+07px radius, padding 0px 12px 0px 20px.
- **link:** transparent fill, #D0CDCD text, padding 0px.

## Do's and Don'ts

- Do use #F7F5F3 for the page and lift surfaces in small steps: #F2F1F0, #FCFBFA, #FFFFFF, #E8E6E4.
- Do keep text in 3 levels: #0D0D0D, #6E6A69, #9A9796.
- Do let contrast carry emphasis; primary actions use #0D0D0D on #F7F5F3.
- Do set headlines in cosmosOracle with tight tracking (-0.04em).
- Do reuse the measured spacing steps (8px, 16px, 20px).
- Do make buttons and chips fully rounded (9999px); most other elements use 16px corners.
- Don't use #9A9796 for body text; it reaches 2.7:1 on #F7F5F3. Keep it for large text or metadata.
- Don't introduce new font families beyond cosmosOracle.
- Don't add saturated accent colors; the measured palette is almost entirely neutral.
- Don't make interface transitions slower than 0.00001s.

## Motion

Interface transitions are quick: 1e-05s.

- **Easing:** `ease`, `cubic-bezier(0.4, 0, 0.2, 1)`, `cubic-bezier(0, 0, 0.2, 1)`.
- **Reduced motion:** the page responds to `prefers-reduced-motion`.

Generated by [Sitepeel](https://sitepeel.dev/design-md/cosmos.so/), the free DESIGN.md generator.

What you can build with it

Landing pages, pricing tables, dashboards: your AI coding agent builds them in this style, with these colors, fonts, spacing and buttons instead of its defaults.

Download DESIGN.md, put it in your project’s root folder, then ask your agent for a page.

Prompt · DESIGN.md attached

Build a landing page for my product. Follow for every color, font, spacing value, corner and button.

Guides

Need more than one page?

Design MD in the Sitepeel tools for Chrome measures pages behind a login, combines several pages into one file and works on any site you open.

Explore the tool

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FAQ

Questions

What can I build with the Cosmos DESIGN.md?

Any page or component in this style: a landing page, pricing table, dashboard or sign-up form. Your AI coding agent uses the measured colors, cosmosOracle type, spacing, corners and buttons instead of its own defaults.

How do I use it with Claude Code or Cursor?

Download the file and put it in your project’s root folder, then ask your agent to follow DESIGN.md. Step-by-step guides: Claude Code, Cursor, Codex, GitHub Copilot.

Is this Cosmos’s official design system?

No. Sitepeel measured it from cosmos.so’s public page on October 21, 2026. It is an independent analysis, not made or approved by Cosmos.

Can I use Cosmos’s style in my own product?

Use it to learn, prototype and compare. For a real product, make the style your own, and never copy Cosmos’s logo, name, pictures or text.

How accurate are the values?

Each value was measured on the rendered page after it fully loaded, on desktop and mobile: colors where they appear, type with tracking, spacing, corners, shadows and hover states. Sites change, so check the date at the top.