How to Change a Background Dynamically in a Website. Using CSS and JavaScript, you can dynamically change the background on your website. You use the code to change the background each time a user ...

Click the "Background" tab and select "Graphic" from the "As" menu. Click the "Browse" button, select your background image and click the "Open" button. Select a graphic option in the "Type" section.

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