Change the Theme
In Google Slides, a theme is a collection of presets that includes colors, fonts, background, and layouts. You can select a new theme to modify the way your presentation looks.
Import a New Theme
If you want to apply a theme from another Google Slides presentation or a PowerPoint slideshow, you can import it into your current presentation.
Change the Layout
The layout of a presentation in Google Slides is the manner in which text and images are arranged on a slide. You can change the layout in Google Slides on a computer, an Android device, or an iOS device.
Change the Background Color
You can change the background color of a slide or an entire presentation.
Change the Background Image
You can change the background of a slide or an entire presentation using an image from your computer or from Google Drive.