Marketing Calendar 2026
Cascading Style Sheets (CSS)
CSS is a language used to control how a web page looks. It tells your browser how to display HTML elements, such as setting colours, fonts, spacing, and where elements sit on the page.
CSS works by applying rules to HTML elements. These rules tell the browser how things should look. For example, you can write a rule that makes all the headings blue or aligns buttons to the right side of a section.
Each rule includes a selector (the HTML element or class you want to target) and one or more properties, like font size, background colour, or layout style. Designers and front-end developers use these rules to ensure everything looks polished and on-brand.
In the world of marketing tech, presentation matters. A clean, visually consistent website or platform helps build trust, keep users engaged, and support conversion goals. CSS plays a big role here: it lets teams tweak the visual design without touching the actual content or breaking anything under the hood.
There are a few handy CSS features marketers and developers love:
- Responsive design, which automatically adapts your page layout to fit different screen sizes
- Media queries, which apply different styles depending on the user’s device
- Animations and transitions for interactive or engaging visual effects
You can write CSS in a few ways: right inside an HTML element (inline), in the head of an HTML page (internal), or in a separate file (external). External CSS files are often preferred as they’re easier to manage and help pages load faster.