You need to make it a separate ID/class. It uses the same styling as all the other texts in body.
Or if you want a quick and dirty fix, just add a style to the <div> tag in the template.
Notice on the right, it's referencing Line 90 of Index_Original.css, where body {} is, and the highlighted text at bottm, where I added the style to the div tag.
Btw if you're making edits to the original CSS file, you should record your changes, so you can roll back. Unless you have some kind of revision control. It keeps your edits organized.