What is CSS? — CSS Technical Interview Questions & Answers

The language that styles and lays out HTML.

What is CSS?

  • The language that styles and lays out HTML.
  • CSS is the look of the page: colour, size, space, layout. HTML says ‘this is a heading’. CSS says ‘make headings navy and 28px’. You write rules: selector { property: value; }
  • h1 { color: navy; } changes every h1. .card { padding: 16px; } is a class. #logo is an id. Prefer classes for styling.
  • Trap: inline style on every tag. Trap: thinking CSS is a programming language with if/loops (it isn’t; you can get clever with queries, but start with rules).

Technical Interview Tip: h1 { color: navy; } — HTML structure, CSS look.

Code Examples for What is CSS?

What is CSS? — working example

/* CSS styles HTML via selectors + declarations */
h1 {
  color: #1e293b;
  font-size: 2rem;
}

.card {
  background: #f8fafc;
  padding: 1rem;
  border: 1px solid #cbd5e1;
}

What is CSS? — cSS (Cascading Style Sheets) controls presentation: colors, typography, layout, and visuals.

How to Explain What is CSS? to an Interviewer

What is CSS?

Style language for HTML selector { property: value; }