Click icons below to see these colors in action

Rounded corners can help soften an otherwise sharp design, but they have been difficult to achieve using images. CSS3 includes a simple method for rounding off one or all of the corners of an element’s box: border-radius. Both Mozilla and Webkit have implemented their own versions of border-radius in advance of the final W3C pronouncement, and you need to take these browser extensions into account for the widest interoperability. To set rounded corners:

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How does CSS work? When a visitor loads one of your Web pages, by either typing in the address or clicking a link, the server (the computer that stores the Web page) sends the HTML file to the visitor’s computer along with any files linked to or embedded in the HTML file. Regardless of where the CSS code is, the visitor’s browser will interpret it and apply it to the HTML to render the Web page using that browser’s particular rendering engine that is then displayed in the browser window.

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Drupal8 W3CSS Theme - Bar - Navigation Classes

You can describe color on the screen in a variety of ways, but most of these descriptions are just different ways of telling the computer how much red, green, and blue are in a particular color. Browser-safe Colors? Certain colors always display properly on any monitor. These colors are called browser-safe colors. You’ll find them fairly easy to remember because their values stay consistent. In hexadecimal values, you can use any combination of 00, 33, 66, 99, CC, and FF. In numeric values, use 0, 51, 102, 153, 204, or 255. In percentages, use 0, 20, 40, 60, 80, or 100.