[bodaudinh]

If you want to variations in your color, you can do follow instruction below:

Edit file rainbow.js:

find Line 44:

function nickmausac(classname){
var txtValue = "";
    var b = getElementsByClassName(classname);

    for ( var i = 0; i < b.length; i++ ) {
        txtValue = colorText(b[i].innerHTML,1);
        b[i].innerHTML = txtValue;
    }
}

Change :

txtValue = colorText(b[i].innerHTML,1);

To (1 => i):

txtValue = colorText(b[i].innerHTML,i);

Result:

function nickmausac(classname){
var txtValue = "";
    var b = getElementsByClassName(classname);

    for ( var i = 0; i < b.length; i++ ) {
        txtValue = colorText(b[i].innerHTML,i);
        b[i].innerHTML = txtValue;
    }
}