Cascading Style Sheets

There are a number of tutorials on the internet that teach you how to create colored boxes with rounded corners. Many of these require the use of Javascript which unnecessarily bloats your HTML code. Some, such as this one, use only CSS and HTML to create this rounded effect. A few even show you how to create these rounded corner boxes with fluid, changing widths. However, none of them that I know of teach you how to do all the above, add borders to the boxes, and use multiple background colors. None, of course, except this one.