.box2 { background-color: color-mix(in lch, white 10%, darkblue); } .box3 { background-color: color-mix(in lch, white 30%, darkblue); } .box4 { background-color: color-mix(in lch, white 50%, darkblue); } .box5 { background-color: color-mix(in lch, white 70%, darkblue); }