What's a website without a little bit of sample CSS code?
Screen 1 - Button with rounded corners
Screen 1 contains the HTML markup for a button class called "styleButton," which of course has a hover state as well. The second image is that same button with a green background and black text. This line below is what creates the rounded corners:
Screen 2 - Button Hover
The second image shows the hover state of the styleButton from screen 1
Screen 3 - Stylesheet
The third image contains the CSS markup and overrides for said button.