CSS Forms is a web development tool that allows developers to create and style forms using Cascading Style Sheets (CSS). It provides a wide range of features, including the ability to customize the look and feel of forms, create complex layouts, and add interactive elements such as drop-down
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.