What is CSS
CSS is the key presentational technology that is used in website design.
Prior to CSS, nearly all of the presentational attributes of HTML documents were contained within the HTML markup; all font colors, background styles, element alignments, borders and sizes had to be explicitly described, within the HTML.As a result of, development of large web sites, where fonts and color information were repeatedly added to every single page, became a long and expensive process.
CSS solve these problems, by allowing web designers to move much of that formatting information to a separate style sheet resulting in considerably simpler HTML markup.
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