Anything on the internet can be modified, deleted or added simply using CSS.
Web design includes many different skills and the restraints on the production and the maintenance of the websites. CSS is used to design the website and writing and telling the images to be in a particular place, like a picture on the top of the page, another in the centre, etc. There are many CSS frameworks used to develop web applications like Sass and LESS. Both are based CSS frameworks, but the complexity of the application by these frames are different. Each of these frames is suitable for various web application development.