Rounded Corner Effect in CSS

1. Begin with a normal styled element such as a div

2. To style all four corners of the div to be the same degree of roundness, use the "border-radius:" property and type a pixel value. The larger the number, the rounder the corner will be. A value of 0px will lead to a 90-degree angled corner

3. To style all four corners to have different degrees of roundness, type four different pixel values

4. The four different pixel values will style the corners clockwise starting from the top left. The first value will style the top left corner, the second value will style the top right corner, the third value will style the bottom right corner, and the fourth value will style the bottom left corner

5. For maximum compatibility, copy your border-radius property three more times, each time with a different compatibility prefix. You should end up with border-radius, -moz-border-radius, -webkit-border-radius, and -o-border-radius