CSS is an abbreviation for Cascading Style Sheets. CSS is indispensable for web designers since it allows to stylise HTML documents. Responsive CSS sets a tone for the UI/UX design for the entire site. Earlier, websites were built using tables, which are now replaced by sheets in CSS. PurpleSyntax, as one of the Best Responsive Web design company in hyderabad, builds all websites using CSS, for better compatibility across devices.