flowmanceBronx eC Design System
Bronx eC is a dark, product-launch style site for a tech or AI business with a shop attached. It feels like a keynote slide: a near-black page, a soft violet glow bleeding in from the top of the hero, short white headlines in Inter Tight 600, and glossy 3D objects floating on pastel gradients. The interface stays black and white; the colour comes from the glow and the renders.
Four signatures make it recognisable:
- The violet hero glow. The hero sits on a background image with a #6F00FF radial glow centred near the top, fading into the #111314 canvas by the bottom of the first screen.
- Fading gradient text. The last words of the hero title (your business.) are filled with a white-to-15%-white gradient running left to right, so the words dissolve into the background. The Bronx. logo fades the opposite way: its B dissolves on the left and the rest is white.
- Title over a hairline. Section titles (What we do) sit on a full-width 1px solid white rule, and the hero title has the same rule under it after 100px of space.
- Horizontal work strip. Services and projects scroll sideways as a row of square-ish 3D render cards, each with a 28px title on the left and a muted metric (-42% Avg CAC reduction) on the right.
Bronx eC is a dark-only design.
Colors
Surfaces
#111314Page background (--black)
#171919The nav bar once the page scrolls (--black-3)
#222222The fill that rises behind an overlay-menu row on hover (--black-4)
#81818B · 20%Form fields and the subscribe bar
Ink
#111314Text on primary
#FFFFFFHeadlines, lead lines, nav icons, rules
#FFFFFF · 70%Body paragraphs (the base p colour)
#FFFFFF · 53%Work-card metrics; footer links and category labels are white at opacity 0.6, which lands close to this
#FFFFFF · 50%small-paragraph notes such as Experience our app – download now
#FFFFFFAction
#FFFFFFWhite pill buttons with near-black text
#FFFFFF · 70%button-main hover (opacity 0.7)
#6F00FFThe hero glow (linear-gradient(231deg, #6F00FF, transparent 91%)) and the default meta-tag fill
#FF0E0EThe round remove button in the cart
Lines & effects
#0E1010Full-screen menu background, a step darker than the page (--black-2)
#FFFFFF · 15%Cart panel border; the faint end of the gradient text
#FFFFFF1px rules under section titles, the hero, menu rows and testimonials
Typography
Inter Tight · display-metric
The quick brown fox jumpsThe three big numbers in the metrics grid. 100px · 600 · 1.3
Inter Tight · headline-lg
The quick brown fox jumpsSection titles: What we do, Unlock your business's ultimate capacity for success. 50px · 600 · 1.1
Inter Tight · body-xl
The quick brown fox jumpsHero lead (Unlock your business's highest capabilities with us,). 28px · 600 · 1.4
Inter Tight · title-lg
The quick brown fox jumpsWork-card titles (Creative Content, B2B Marketing). 28px · 500 · 1.0
Inter Tight · label
The quick brown fox jumpsButtons, footer column headings. 18px · 600 · 1.11
Inter Tight · eyebrow
The quick brown fox jumpsText links such as .button-link, and the 120px project cursor label. 16px · 600 · 1.63
Spacing & shape
| Purpose | Value |
|---|---|
| Container | max 1200px, centred (.container) |
| Section title row | top-grid (1.2fr 1fr, 16px gap) with the title on the left, a 1px white bottom border and 15px padding below; content starts about 50px later |
| Breakpoints | 991px, 767px and 479px, plus min-width: 768px and min-width: 1440px steps |
Spacing scale
| Token | Value | Preview |
|---|---|---|
xs | 10px | |
sm | 16px | |
md | 20px | |
lg | 40px | |
xl | 50px | |
2xl | 100px |
Layout spacing
| Token | Value | Preview |
|---|---|---|
section | 100px | |
nav-height | 100px | |
hero-bottom | 120px | |
hero-top | 190px |
Border radius
Surfaces
How the surfaces stack, from the page background up. Hex codes and roles are in Colors above.
Motion
| Fade-up on scroll | opacity 0 → 1 and y 20px → 0, 500ms ease |
| Quick reveal | opacity 0 → 1, y → 0, 300ms outCubic |
| Slow fade | opacity 0 → 1, 1000ms outQuart |
| Pop in | scale 0 → 1, 600ms outExpo; the reverse, scale → 0, runs 400ms outExpo |
| Text roll | Inner text y → 0%, 500ms outExpo inside an overflow-hidden mask |
| Work strip | Horizontal move driven by page scroll |
| Underline grow and menu-row fill | Size change, 400–500ms outCubic / ease |
| Cursor label | The 120px circle follows the mouse |
| Hover transitions | Links all 0.3s; circle button background-color 0.2s cubic-bezier(0.645, 0.045, 0.355, 1) |
Do’s and don’ts
- Keep the page on canvas #111314 with white ink headlines in Inter Tight 600.
- Put the #6F00FF glow behind the hero only, as a soft radial light that fades into #111314.
- End a hero title with a white-to-#FFFFFF26 gradient phrase.
- Put a 1px solid white rule under section titles (top-grid) and under the hero title.
- Use the white pill (button-primary, 70px tall, 40px radius) for the one main action, with #111314 text.
- Pair every work image with a title-lg name and a numeric result in ink-subtle.
- Fill buttons, tags or text with violet. The only coloured surfaces are the glow and the renders.
- Add shadows, blur or rounded image corners; images are square-cornered.
- Use grey hex values for text. Muted text is white at 70%, 53% or 50%.
- Leave input text at the measured #333333 on the dark field; it is nearly invisible. Set typed text to ink.
- Use ink-faint (white at 50%) for anything other than 16px+ notes.
- Animate for longer than 600ms outside the 1000ms slow fade, or add bounce easing.
Example prompt
Any page in the Bronx eC style
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Pick a file to see what it’s for and where it goes.
What it is
The whole design system in one markdown file, written for AI: every color, type style, spacing value, component and motion rule, plus do's, don'ts and a ready prompt.
Best for
Claude, ChatGPT, Gemini, Cursor and v0, or any other AI tool that builds pages or code.
How to use it
- Put
DESIGN.mdin your project and mention it in your request, or save it as.cursor/rules/bronx.mdc - For the rule file, start it with a front-matter block that sets
alwaysApply: true, so every chat uses it - Ask: “Build a pricing page using DESIGN.md.” Cursor follows the colors, fonts, spacing and rules
- Put
DESIGN.mdin the project root - Add one line to
CLAUDE.md: “Follow DESIGN.md for all UI.” - Ask for any page or component; Claude reads the file first
- Attach
DESIGN.mdto the chat (or paste it in) - Ask: “Build a landing page in this design system.”
- Keep the file in the chat or project knowledge, so follow-up pages stay on style
What it is
Every token as data, in the W3C Design Tokens format: colors with their roles, type styles, radius, spacing, and component tokens that point at them.
Best for
Figma (Tokens Studio), Style Dictionary and other design-token tools, and build scripts.
How to use it
- In Figma, open Tokens Studio, choose Import, and pick
tokens.json - Or point Style Dictionary’s
sourceat it to generate tokens for any platform - In code, import it like any JSON file
What it is
A Tailwind CSS v4 theme: every color, font, type style, radius and spacing value becomes a Tailwind utility, like bg-canvas, text-headline-lg or rounded-md.
Best for
Tailwind v4 projects, and AI builders that write Tailwind (v0, Lovable, Bolt).
How to use it
- Save
theme.cssnext to your main CSS file - Import it after Tailwind:
@import "tailwindcss"; @import "./theme.css"; - Use the classes:
bg-canvas text-ink rounded-md p-lg
What it is
The same tokens as plain CSS variables on :root. Component values point at the color variables, so changing one color updates everything that uses it.
Best for
Any website: plain CSS, Webflow custom code, Framer, WordPress.
How to use it
- Add it to your stylesheet, or in Webflow paste it into Site settings → Custom code inside a
<style>tag - Use the variables anywhere:
color: var(--color-ink) - Change a token once and every place that uses it follows