I can change the font sizes a number of ways. Here's a few:
This is font size "+1." This is font size "+8."
This is font size "1." This is font size "8."
This is font size "-1."This is font size "-4."
Try the numbers between these extremes and see what you get.
There are a variety of ways to add color and a lot of colors beyond those recognizeable by letter names. Check out the colors page to see them.
Non-word color designations are put in with the "#" sign.
This is H1 or headline one.
This is H5. Note the difference in size and boldness. This bigger the number the smaller the typeface.