Spring GDS 25th Anniversary
A logistics company that ships to 190 countries built something to ship to itself.
CSS
What is CSS?
CSS, Cascading Style Sheets, is the language that controls how a web page looks. HTML defines the structure and content; CSS decides the layout, color, typography, spacing, and how all of it responds to different screen sizes. Without it, every web page would be black text on a white background, stacked top to bottom.
The "cascading" part is the core idea. Styles flow down and combine according to rules of specificity and order, so a button can inherit the site's font, then override its own color, then change again on hover. Modern CSS handles layout with Flexbox and Grid, adapts across devices with media queries, and holds shared values in custom properties. A single stylesheet can restyle an entire site at once: change one color variable and every button, link, and heading that references it updates together, across hundreds of pages, without touching the HTML. That is also why CSS gets messy at scale. Styles that affect everything are powerful and easy to break.
It looks simple and is deceptively deep. Centering things, managing layered elements, and keeping a large stylesheet from collapsing under its own weight are real engineering problems, not cosmetic ones.
CSS at Dallonses
We treat CSS as engineering, not decoration applied at the end. A stylesheet that grows without structure becomes the thing nobody wants to touch, where every change risks breaking something three pages away. We build ours to scale, so the styling stays as maintainable on month twelve as it was on day one.
Because our design and development work happens together, the CSS reflects design decisions faithfully and stays organized around a system rather than one-off fixes. On web design and user interface work we structure styles around reusable tokens and components, which is what keeps a product visually consistent as it grows. The result is styling a client's team can extend confidently, instead of a fragile layer they are afraid to edit.
Stylesheet that's become impossible to change safely? Let's untangle it.
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