CSS Transforms is a feature of Cascading Style Sheets (CSS) that allows elements on a web page to be transformed in two-dimensional or three-dimensional space. CSS Transforms can be used to scale, rotate, translate, and skew elements on a web page. This
From Wikipedia
Cascading Style Sheets (CSS) is a style sheet language used for specifying the presentation and styling of a document written in a markup language, such as HTML or XML. CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.