What to Know Place a figure tag around the image. Within that, add your caption in the figcaption tag. Optionally, add some CSS to spruce up the caption with its own background and colors.

In Google Docs, you can add watermark, picture and solid color background to your page. Learn how to insert Background Images in Google Docs.

Google says images styled with CSS won’t be indexed in Image Search, advising developers to use HTML tags for important visuals.