prismdinstrument

EXTRACTED · 10 SECTIONS · 249 COLORS · GRADE B

posthog.com

Accent #cd8407 · IBM Plex Sans Variable — every value below measured via getComputedStyle(), not asserted by hand.

249

colors

faces

shadows

keyframes

DESIGN.md tokens.json

real render · source of truth

posthog.com is built on a warm, off-white canvas (rgb(238, 239, 233)). The system uses rgb(205, 132, 7) as the high-saturation accent for primary actions. Crisp CTAs (4px radius) reinforce a precise, technical aesthetic alongside IBM Plex Sans Variable as the primary typeface. IBM Plex Sans Variable is paired with IBM Plex Sans for secondary roles. A restrained elevation system (2 distinct shadows) — shadows reserved for the few elements that must lift off the page. Motion is a first-class concern — 43 keyframe animations plus transition-driven interactions.

Color — roles, semantics & the full census

249 colors measured · click any swatch to copy

Canvas

#eeefe9

AAA 16.33:1

Ink

#111111

AAA 16.33:1

Accent

#cd8407

Fail 2.63:1

Line

#bfc1b7

Fail 1.58:1

Semantic states

No semantic state colors detected — this system signals state through weight & motion, not hue.

249 colors mined from the live renderexpand

Type — the ladder, in the real face

5 roles · rendered live in the real IBM Plex Sans Variable (captured woff2) · lines are editable, click any spec to copy

display xl

display-xl24px · 800

display md

display-md19.2857px · 600 · ×1.24

body

body16px · 400 · ×1.21

body sm

body-sm15px · 600 · ×1.07

button

button13px · 500 · ×1.15

Depth — elevation is extracted, not invented

2 box-shadows measured on the live page · click a tile to copy its raw value

shadow-1

shadow-2

Motion — easings, transitions & live keyframes

1 easing curve · 43 keyframes · hover a tile to preview

Easing & transitions

transition-2cubic-bezier(0.4, 0, 0.2, 1)

43 keyframe animations extracted

slideRight

rcSliderTooltipZoomDownIn

rcSliderTooltipZoomDownOut

wobble

breathe

develop

flash

float

gradient-rotate

grow

grow-sm

hogfather-jump

Spacing & radius, made spatial

9 spacing steps · 7 radii · bars are exact px widths

Spacing scale

xxs · 2px

xs · 4px

sm · 8px

md · 16px

base · 32px

lg · 40px

xl · 48px

2xl · 56px

3xl · 64px

Radius

none
0px

xs
4px

sm
8px

md
9999px

lg
10007px

xl
10015px

full
9999px

Components — the closed vocabulary

11 component families · 33 variants counted on the live DOM

Component	Variants found
buttons	×10
links	×8
nav Links	×3
tabs	×3
heading H1	×2
captions	×2
cards	×1
heading H2	×1
heading H3	×1
code Block	×1
alert	×1

Component style specs (§4)expand

Buttons

Ghost

Background: transparent
Text: #23251d {colors.ink-subtle}
Padding: 2px 8px
Radius: 4px
Font: 13px weight 500
Use: Subtle action, toolbar, nav button
Focus: backgroundColor: rgb(200, 202, 193)

Primary Brand

Background: #cd8407 {colors.primary}
Text: #23251d {colors.ink-subtle}
Padding: 0px
Radius: 6px
Border: 1px solid rgb(177, 120, 22)
Font: 16px weight 400
Use: Primary CTA / brand action
Focus: backgroundColor: rgb(200, 202, 193)

Ghost

Background: transparent
Text: #23251d {colors.ink-subtle}
Padding: 2px 4px
Radius: 4px
Border: 1px solid rgba(0, 0, 0, 0)
Font: 13px weight 400
Use: Subtle action, toolbar, nav button
Focus: backgroundColor: rgb(200, 202, 193)

Light / Invert

Background: #e5e7e0 {colors.surface-1}
Text: #65675e
Padding: 4px 6px
Radius: 4px
Font: 16px weight 400
Use: Bright CTA on dark sections
Focus: backgroundColor: rgb(200, 202, 193)

Subtle

Background: rgba(210, 211, 204, 0.5)
Text: #23251d {colors.ink-subtle}
Padding: 12px 8px 4px 20px
Radius: 0px 0px 6px 6px
Font: 12px weight 400
Use: Quiet action against page bg
Focus: backgroundColor: rgb(200, 202, 193)

Cards & Containers

Standard Card

Background: transparent
Padding: 16px 32px
Radius: 0px
Use: Content containers, listing items

Tabs

Pill Tab

Layout — structure & dimensions

4 layout metrics measured

max Width1200px

header Height64px

sidebar Width267px

container Padding0px

Responsive — real breakpoints

12 media-query stops read from the live CSS

425px

482px

640px

767px

768px

800px

900px

1024px

1076px

1160px

1280px

1536px

Do's & Don'ts

21 enforceable rules pulled verbatim from the spec

Use Whitesmoke (`#eeefe9`) as the page background — it's intentionally not pure white

Use IBM Plex Sans Variable as the primary typeface — it defines the brand personality

Use negative letter-spacing (-0.6px) at display sizes for compressed, editorial headlines

Use the extracted shadow patterns for elevation — they are tuned to match the brand palette

Use full-pill radius (9999px) only for specific elements (avatars, pills, toggles)

Use #cd8407 (`#cd8407`) as the primary accent — it's the brand's signature interactive color

Use 6px border-radius on buttons — the standard corner rounding for interactive elements

Apply 16px 32px padding inside cards — matches the design system's content breathing room

Respect the 4px–48px spacing range — the design uses a wide scale for visual breathing room

Make the hero full-viewport (≥70% screen height) — this design uses an immersive hero, not a tall navbar

Build the hero as a split layout with media on the left — text and visual share equal weight

Include exactly 13 CTAs in the hero (primary + secondary) — this design pattern is multi-action, not single-purpose

Each card uses an icon (not photo) — the visual language is illustrative, not photographic

Use a 4-column grid on desktop — density matters for this content type

Don't

Don't use pure white (`#ffffff`) as a page background — the warm tone is part of the brand identity

Don't substitute with generic sans-serif or serif — the custom font carries the brand

Don't increase letter-spacing on headings — the type is designed to run tight at scale

Don't invent new shadow values — use only the extracted shadow levels

Don't apply pill radius on rectangular buttons or cards — it's reserved for specific interactive elements

Don't introduce additional saturated accent colors — the palette is intentionally controlled

Don't over-build the footer — this design keeps it minimal (1 cols, 0 links)

Agent guide & export

Paste-ready prompt + the real files behind this page

Build a UI in the posthog.com design system. Canvas #eeefe9 · ink #111111 · accent #cd8407. Type: IBM Plex Sans Variable — respect the size/weight ladder in §3. Radius, spacing, shadow: use only the extracted scales (no magic numbers). Full spec follows — paste the DESIGN.md below into your agent.

Every value above was getComputedStyle-verified.

$ npx prismd add posthog

DESIGN.md · narrative spec tokens.json

A · Instrument B · Press