As you may know, HTML (HyperText Markup Language) - is a language for web page markup. Its main goal is to translate information given in the form of readable content. Mostly, because of HTML, we see the Web as it is, we see its beauty, color and multi-functionality.
Cascading Style Sheets allow you to keep the color, text size, and other parameters in styles. A style is a set of formatting rules, which are applied to some parts of a document to quickly change its appearance.