People often confuse the two, but CSS-in-JS is a distinct concept from "inline styles" (which can make pseudo selectors more challenging). Almost all CSS-in-JS

People often confuse the two, but CSS-in-JS is a distinct concept from "inline styles" (which can make pseudo selectors more challenging). Almost all CSS-in-JS solutions (including styled-components mentioned in the article) still support pseudo selectors, media queries, etc.