.foo {
    color: rgb(255, 0, 153);
    color: rgb(100%, 0%, 60%);
    color: rgba(51, 170, 51, 0.1);
    color: hsl(.75turn, 60%, 70%);
    color: hsl(270 60% 50% / .15);
    color: hsla(240, 100%, 50%, .05)
}