Apply a theme to your presentation
Applying a theme is a fast way to give your slides an attractive, professional look. Apply a theme to all slides or some slides.
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Select Design. Hover over a Theme to preview how it would make your slide look.
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Select More
to see more themes. -
Click to select the theme you want to apply.
By default, the theme you select applies to all slides in your presentation.
To apply a theme to only one or a few slides, select the slide or slides, right-click the theme you want, and select Apply to Selected Slides.
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If you want to change the color scheme, fonts, effects or the background style, in the Variants group, select More
.
Create and save a custom theme
Create a custom theme by modifying an existing one.
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Select your first slide. On the Design tab, select the down arrow in the Variants group.
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Select Colors, Fonts, Effects, or Background Styles to customize the theme.
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Select the down arrow in the Themes group, and select Save Current Theme.
Source: Microsoft