Businesses are greatly influenced by their environment. All the situational factors which determine day to day circumstances impact firms. So, businesses must constantly analyze the trade environment and the market. There are many strategic analysis tools that a firm can use, but some are more common.
CSS is a style language that defines layout of HTML documents. For example, CSS covers fonts, colours, margins, lines, height, width, background images, advanced positions and many other things. Just wait and see! HTML can be (mis-)used to add layout to websites.
CSS stands for Cascading Style Sheets in context of web development. It is a style sheet language used for describing the presentation of a document written in a markup language. I'm not sure about USS as far as web development is concerned. However, USS stands for Unix System Service.