Another way to change font size is within the FONT tags.
This is used with or without the other extras such as color
<font size="1"> Size 1 </font> Size 1
<font size="2"> Size 2 </font> Size 2
<font size="3"> Size 3 </font> Size 3
<font size="4"> Size 4 </font> Size 4
<font size="4" color="purple"> Size 4 Purple </font> Size 4 Purple
Note both require quotes, but are combined to do both. One </font> to close. Higher numbers may be used for even larger size.