1. What is CSS? CSS (Cascading Style Sheets) is a stylesheet language used to describe the presentation (layout, colors, fonts, etc.) of a document written in HTML or XML. 2. What is the box model in CSS? The box model represents the structure of an HTML element, consisting of four areas: Content : The actual content of the element (text, images, etc.). Padding : The space between the content and the border. Border : The area surrounding the padding. Margin : The space outside the border, separating the element from other elements. 3. What is the difference between relative , absolute , fixed , and sticky positioning in CSS? Relative : Positions an element relative to its normal position. Absolute : Positions an element relative to its nearest positioned (non-static) ancestor. Fixed : Positions an element relative to the viewport, and it does not move when the page is scrolled. Sticky : A hybrid of relative and fixed positioning; the element toggles between relative and fixed based o...