Quick Styles gallery on the Home tab.
So where do you find styles? Look no further than the Quick Styles gallery, on the Home tab, in the Styles group. Each Quick Style includes sets of formatting such as font, font size, color, and more.
Quick Styles are grouped under Style Sets, which are different groups of styles that have been designed to work together. We'll talk more about Style Sets and how to change them in lesson two.
In the picture you can see:

The
Quick Styles gallery, which shows some of the
Quick Styles available under the
Style Set currently in use by the document.

The expanded gallery, which you can open by selecting the down button to the right of the gallery.