flowmanceBuild X Design System
Build X looks like site signage: pure black, safety yellow (#FFD700) and white, nothing else. Type is BDO Grotesk at weight 600, set big and plain. Shapes are hard: square buttons, square cards and slanted cut-outs, with yellow wedges and black polygons that tilt across section edges. Photography is real construction work, from aerial quarry shots to a smiling worker in a hard hat.
Four signatures make it recognisable:
- Square yellow buttons with an arrow. The main actions are 0-radius #FFD700 blocks with black 16px semibold text and a → arrow: Get a Quote →, Meet the Team →, View More →.
- Slanted cuts. The hero photo ends on a diagonal black polygon; the services band frames black cards with angled yellow wedges and slanted bars. Edges are never just horizontal.
- Fine diagonal line patterns. Thin light lines run diagonally over the hero photo and the yellow FAQ band, like a blueprint overlay.
- The hollow square eyebrow. A small yellow-outlined square, then white uppercase text with 1px tracking: □ WHAT WE OFFER.
Build X is a dark-only design, with yellow bands as the contrast.
Colors
Surfaces
#000000Page background (--white is black in this template)
#111111The quote section band (.section.gray)
#121212Testimonial cards, dropdown item hover
#181818Form fields
#222222Small raised blocks
#181818#FFD700The yellow services and FAQ bands
Ink
#000000Text on primary
#FFFFFFHeadings, nav, list items (--gainsboro is white)
#FFFFFF · 60%Paragraphs: the base p has opacity: .6 on white
#FFFFFF · 90%Eyebrows (.text-element, opacity: .9)
#000000Text on inverse-canvas
#FFFFFFText on photos
Action
#FFD700Buttons, icon tiles, metrics, play button, category tags (--green-dark is gold)
#FFD700Lines & effects
#FFFFFF · 12%Field borders, the rule above the features row
#FFFFFF · 15%Cart and dividers
#000000 · 50%Hero overlay and slider arrow boxes
Typography
BDO Grotesk · display-metric · shown in Inter (fallback)
The quick brown fox jumpsGold metrics: 14+, 1,300, $14M. 80px · 600 · 1.2
BDO Grotesk · headline-lg · shown in Inter (fallback)
The quick brown fox jumpsSection titles: Explore our services, Hear from our satisfied clients. 46px · 600 · 1.3
BDO Grotesk · title-lg · shown in Inter (fallback)
The quick brown fox jumpsBlog titles. 25px · 600 · 1.4
BDO Grotesk · body-lg · shown in Inter (fallback)
The quick brown fox jumpsHero subline. 21px · 500 · 1.4
BDO Grotesk · label-nav · shown in Inter (fallback)
The quick brown fox jumpsNav and footer links (1.1rem). 17.6px · 600 · 1.14
BDO Grotesk · eyebrow · shown in Inter (fallback)
The quick brown fox jumpsWHAT WE OFFER. 14px · 700 · 1.4 · 1px
Spacing & shape
| Purpose | Value |
|---|---|
| Container | max 1200px, centred, with 5% side padding (72px at 1440px) |
| Section rhythm | 100px top and bottom (.section), 60px from ≤991px; the quote band has 140px, 60px at ≤479px; the news section 100px top and 50px bottom; the footer 20px top and 30px bottom with 50px inside its grid |
| Breakpoints | 991px, 767px, 479px, plus 1280px, 1440px and 1920px+ steps |
Spacing scale
| Token | Value | Preview |
|---|---|---|
xs | 5px | |
sm | 10px | |
md | 15px | |
lg | 25px | |
xl | 34px | |
2xl | 50px | |
3xl | 80px |
Layout spacing
| Token | Value | Preview |
|---|---|---|
section-gutter | 72px | |
section | 100px | |
section-band | 140px |
Border radius
Surfaces
How the surfaces stack, from the page background up. Hex codes and roles are in Colors above.
Motion
| Fade-in on scroll | opacity 0 → 1, 1000ms outQuart |
| Parallax | Elements shift y ±30px, ±50px, ±80px (and x ±80px) while scrolling in view, 500ms |
| Scale | scale → 0 over 1500ms ease and → 1 over 1000ms ease; 1 ↔ 1.1 over 500ms |
| Image hover zoom | scale 1 → 1.1, 100ms ease, back on mouse out |
| Button arrow nudge | x 0 → 3px, 500ms outQuint |
| Hero slider | Slides move to x 0%, 600ms outExpo |
| Dropdown | Arrow rotates 400ms swingTo; size and border ease 200–400ms |
| Link hovers | opacity 0.3s; button background 0.2s cubic-bezier(0.645, 0.045, 0.355, 1) |
| Nav on scroll | Page scroll up and down triggers move the header |
Do’s and don’ts
- Keep the palette to canvas #000000, ink #FFFFFF and primary #FFD700.
- Use square (0px) yellow buttons with black 16px semibold text and a → arrow.
- Cut section edges on a slant with black or yellow polygons.
- Show proof in big gold display-metric numbers with muted labels.
- Open sections with the hollow yellow square and an uppercase eyebrow.
- Set paragraphs in white at 60% (ink-muted), weight 600.
- Round buttons, cards or images; only icon tiles (10px), the form button (6px) and circles are round.
- Put yellow text on a yellow band or white text on yellow.
- Add a second accent; the green and grey variables in the CSS are unused.
- Use soft shadows or glass; depth comes from bands and overlays.
- Use light weights; stay at 500–700.
- Use stock office imagery; keep it on site, with machinery and hard hats.
Example prompt
Any page in the Build X style
More design systems like this
Construction design systems, the same colors first.
Bring any of them to your AI tool
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Get All AccessUpgrade to All AccessHow to use the Build X design system
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/build.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