CSS
CSS (Cascading Style Sheets) is a style sheet definition by W3C Consortium. It is a feature added to HTML that gives both web site developers and users more control over the way pages are displayed. With CSS, designers and users can create style sheets that define how different elements, such as headers and links, appear. These style sheets can then be applied to any web page. The term cascading derives from the fact that multiple style sheets can be applied to the same web page. Official website: https://www.w3.org/Style/CSS/