# Media query

A rule that applies styles at certain screen sizes.

**Source:** “Fluid grids, flexible images, and media queries are the three technical ingredients for responsive web design” [Responsive Web Design (A List Apart)](https://alistapart.com/article/responsive-web-design/)

---

Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/glossary/media-query