1-It offers a rich set of options to change every little aspect of your web page, including fonts (size, color, family, and so on), colors and background colors, borders around HTML elements, positioning of elements in your page, and much more.2-CSS is widely understood by all major browsers today, so it’s the language for visual presentation of web pages and very popular among web developers.
3-CSS overcomes the problem of mixed data and presentation by enabling you to define all formatting information in external files. Your ASPX or HTML pages can then reference these files and the browser will apply the correct styles for you.
4- CSS can be placed directly in an HTML or ASPX page, which gives you a chance to add small snippets of CSS exactly where you need them.
5-Because all CSS code can be placed in a separate file, it’s easy to offer the user a choice between different styles — for example, one with a larger font size. You can create a copy of the external style sheet, make the necessary changes, and then offer this alternative style sheet to the user.
6-The decrease in bandwidth that is required for your site. Style sheets don’t change with each request, so a browser saves a local copy of the style sheet the first time it downloads it. From then on, it uses this cached copy instead of requesting it from the server over and over again.
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