Håkon Wium Lie (born July 26, 1965, in Halden, Norway,) is a Norwegian web pioneer, a guidelines dissident, and the Chief Technology Officer of Opera Software. He is most popular for creating Cascading Style Sheets (CSS) while working with Tim Berners-Lee and Robert Cailliau at CERN in 1994. CSS describes how web pages are presented — on screens, in print, or read out loud. As you know that Tim Berners Lee already invented Html (Hypertext Markup Language), for adding style and giving a handsome look, we use CSS in the HTML document.