There are four basic color schemes that you can use for a Web site. Each page of this article shows a picture of the color scheme, and how you can generate a similar scheme in Photoshop.
Using colors of the same hue. They may have different tints or shades depending upon how much white or black is added.
This uses colors that are close to one another on the color wheel.
This is often seen as "opposite" because the two colors in a complementary color scheme are opposite one another on the color wheel.
These colors are evenly spaced on the color wheel.
All the color schemes will use this yellow as the base color.