Overriding Theme Settings for Text Size/Color on Pages

Another simple question.

I'm trying to create a Homepage for a Forum style website which basically has a bunch of links to the different forums on the home page.

I am trying to Add New Page for the homepage and enter html into the edit box.

But it's not letting me change the font size or link color with html.

Seems to be grabbing the themes present settings.

What am I doing wrong?

Tks