The color scheme you are referring to is known as a split complementary color scheme. It involves choosing one color (the hue) and then selecting the two colors on either side of its complement (the hues on each other side of its complement on the color wheel) to create a harmonious color palette. For example, if you choose red as your hue, the complementary color is green, so the split complementary colors would be yellow-green and blue-green.
