Design systems
One set of styles shared by an app and a marketing site, as in Sales OS.
Frontend
CSS development services and why there is no CSS3 or CSS4
We have no case study of hand-written CSS. Our Tailwind CSS work sits on top of it, and MDN says everything is now just CSS, with each module carrying its own level.
0Case studies of hand-written CSS
0CSS3 or CSS4 releases, per MDN
LevelsHow CSS modules carry version numbers
1Published Tailwind CSS build
What we build
What we would take on in CSS
Utility-first styling
Tailwind CSS beside React and Next.js.
Style clean-ups
Old stylesheets moved to current CSS before a redesign.
Layouts for every screen
Pages that hold from a phone to a wide desktop.
Architecture
Where CSS sits in a build
CSS under a utility framework
Source
Tailwind CSS 3Utility classes
CSSHand-written styles, not named in the case
Interface
React 19 and Vite 8App UI
Next.js 15Marketing site
Reader
BrowserApplies the styles
From Sales OS. The case names Tailwind CSS 3, Radix UI and Lucide icons. It does not name hand-written CSS, so that node is dashed.
Standard
There is no CSS3 or CSS4
How CSS versions work, per MDN
No CSS3 or CSS4Everything is now just CSS, and individual modules have version numbers.
Modules and levelsFor example, CSS Color Module Level 5.
SnapshotsW3C periodically takes a snapshot of the latest stable state of the specification.
Source: MDN Web Docs, CSS, last modified 29 December 2025, checked 9 November 2026.
Builds
The closest build we can show you
AI product, in-house
Sales OS
A React 19 app and a Next.js 15 marketing site styled with Tailwind CSS, Radix UI and Lucide icons.
1 creditOpens all six tabs of an account brief
Fit check
When hand-written CSS is the right call
Pick CSS when
- A small site with a few components
- Styles that must work without a build step
- A design that no utility set fits
Look elsewhere when
- You need a case study of hand-written CSS, which we do not have
- A large app with many contributors, where we used Tailwind CSS
- A team that already runs a utility framework
Explore
Same job, other tools
Pairs with
Where we used it
Stack
What CSS usually ships with
React
Angular
TypeScript
Vue.js
Node.js
DockerFAQs
What buyers ask first
Is there a CSS3?
MDN says there will never be a CSS3 or a CSS4. Everything is now just CSS, and individual CSS modules carry version numbers, such as CSS Color Module Level 5.
Do you have a published hand-written CSS build?
No. We say so on the first call and show the nearest work, which is a Tailwind CSS build on React and Next.js.
Tailwind CSS or plain CSS?
Our published work uses Tailwind CSS. We say on the first call when plain CSS is enough.
Who owns the code and the cloud accounts?
You do, from the first commit. Repositories and cloud accounts stay in your name.
Tell us how your styles are built
Thirty minutes on your styles, your design system and your front end. No sales pitch.