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Cascading Style Sheets, or CSS, is a simple design language that we use to make web pages beautifull and presentable. All the styling information for your website or app will live in a file called style.css most of the time. CSS is different from HTML, using HTML you create the structure of your page and with CSS you add styles to your page. Using CSS, you can set the colors, fonts and background images etc. You can also make your own list bullets by using the list-style-image property.