Selenium WebDriver How TO change Font Size Using Eclipse

I am using Eclipse and webdriver. I am trying to change the font in an iframe box. The problem that I am having is the text that I use with .sendkeys types in normal text. Is there a way for me to change the text size and fonts. I will upload a picture of what I am trying to achieve. Please write the commands that will work in eclipe. I appreciate it. Any help is better then none.

Why would you want to do that?

tarun3kumar wrote:Why would you want to do that?

I would just like to learn proper commands using selenium webdriver in eclipse to perform the task.
I have no idea what commands I must use in eclipse to make a font change its size or color. Any help would be much appreciated.