Title default is set as font-weight: bold in the Template Configuration Window under Template Options in the Restricted Formatting Styles.

Subtitle default is set as font-style: italic in the same place as the Title.

Smallest = font-size: xx-small

Smaller = font-size: x-small

Small = font-size: small

Normal = font-size: medium

Large = font-size: large

Larger = font-size: x-large

Largest = font-size: xx-large