Color wheel and Complementary colors
Color wheel
#ff0000
#ff8000
#ffff00
#80ff00
#00ff00
#00ff80
#00ffff
#0080ff
#0000ff
#8000ff
#ff00ff
#ff0080
Complementary colors
Two colors opposite on the color wheel.
#ff0000
#00ffff
#ff8000
#0080ff
#ffff00
#0000ff
#80ff00
#8000ff
#00ff00
#ff00ff
#00ff80
#ff0080