CSS Conditional Rules allow web developers to apply different styles to web pages based on certain conditions. These rules can be used to target specific browsers, devices, or screen sizes, and can be used to create responsive designs that look great on any device. With CSS Conditional Rules, you can
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.