You can add a background to your PowerPoint slides in a few different ways, depending on the look you're going for. Here's how to do it:

Option 1: Add a Solid Color or Gradient Background

  1. Right-click on the slide (in the main area or slide thumbnail).
  2. Select Format Background.
  3. Choose:
    • Solid Fill: Pick a color.
    • Gradient Fill: Choose or customise a gradient.
  4. Click Apply to All if you want it on every slide.

Option 2: Add an Image as a Background

  1. Right-click on the slide > Format Background.
  2. Select Picture or Texture Fill.
  3. Click Insert:
    • Choose From File to upload an image.
    • Or use Online Pictures to search the web.
  4. Adjust transparency if needed to make text more readable.
  5. Click Apply to All if you want it on every slide.

Option 3: Use a Design Theme

  1. Go to the Design tab.
  2. Choose a theme or click More to browse.
  3. Use Variants to tweak colours and styles.

Microsoft PowerPoint - How to add a background picture