Simple Buttons

1. Create new file with 72 PPI and white background.

2. Select Elliptical Marquee tool. Place the cursor in the center of the image approximately.

3. Press Shift+Alt and draw perfect circle.

4. Select foreground and background color.

5. Select Gradient tool.

6. Drag from top left to bottom right.

7. With the image selected,

Select > Modify > Contract

8. Input the value 7.

9. Click the Gradient tool again and drag over the image from bottom right to top left.

10. Press Ctrl +D to deselect.