Make each navigation option text a different colour

Plug this into your Custom CSS and see if that's what you are looking for...  Obviously, you can change the colors in the css to anything you want.

nav.main-nav ul > li:first-of-type a {
    color: red !important;
}

nav.main-nav ul > li:nth-of-type(2) a {
    color: blue !important;
}

nav.main-nav ul > li:nth-of-type(3) a {
    color: pink !important;
}

nav.main-nav ul > li:nth-of-type(4) a {
    color: orange !important;
}

nav.main-nav ul > li:nth-of-type(5) a {
    color: aqua !important;
}

nav.main-nav ul > li:nth-of-type(6) a {
    color: green !important;
}