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External CSS. The external style sheet is generally used when you want to make changes on multiple pages. It is ideal for this condition because it facilitates you to change the look of the entire web site by changing just one file. Cascading Style Sheets, better known as CSS, enable you to control the style and layout of a web page. They will enable you to specify link styles, fonts, margins, tables, colors, sizes, alignments and much more throughout your entire web page.