Color Testing

You'll need to use Custom CSS that includes the following:

-Selectors that include the page IDs for the blog page and the individual blog posts
-The CSS attributes that will add the style to the blog page and posts (for font, font size, etc.)

The CSS for the blog page should look something like this:
[code=auto:0]body.blog {font-family: FONTNAME;}[/code]

body.blog = The selector
{font-family: FONTNAME;} = The CSS attribute

The same applies to CSS for the individual blog posts.

To find the selectors you need and use Custom CSS to achieve the look you're going for, please refer to the Firebug tutorial at the bottom of this documentation: