How we change the font style of my blog description

Change the font style of the main text on my page.I tried adding something in html and You can change the description font style by editing the css, which is located in the template HTML
Go to Design Tab of you Blog interface and then click the template HTML and click on "Expand Widget Templates." Search for the code that says.

<p class='description'><span><data:description/></span></p>

That's where your blog description is located. To add css to the HTML do something like this:

<p class='description'  style='font-family: Helvetica'>

<span><data:description/></span></p>

Find more about css font-size at http://www.w3schools.com/css/pr_font_font-size.asp

IF You can change the description font style by editing the css find where it says

.Header .description {
  font-size: $(description.text.size);
  color: $(description.text.color);
}