A theme is a set of formatting choices that can be applied to an entire document and includes theme colors and fonts.
1. On the Design tab, tap Themes.
2. Select a theme.
Change theme colors
1. Select Design, Themes, Colors.
2. Tap on the current color set.
3. Change any element's color.
4. Tap Apply to use this once, or tap Save New Color set.
Change theme fonts
1. Select Design, Themes, Fonts.
2. Tap the current font set.
3. Change theme's heading and/or body fonts
4. Tap Apply to use this once, or tap Save New Font set.