Overlay two gui labels

I am trying to give the effect of multicoloured text by overlapping two gui labels and adding a space to the label that is not being changed so it would look something like this:

 string one = "U i y A s e s;
 string two = " n t   n w r;

which when overlapped would read: "Unity Answers";

But adding a space where their isn't a character does not move the letters over enough. How can I ensure the correct gap or is their any easier way to have multicoloured labels.

Thanks