Update the background picture on your Tumblr blog, ... Click the "Edit HTML" button beneath the theme you wish to change. The theme's HTML code appears. Search for "" in the HTML code.

Launch Microsoft PowerPoint, and open the PPTX file for which you want to use a GIF as the background. Select the appropriate slide. Click the "Design" tab, and locate the "Background" section.

How to compose a House of Cards shot: blue up front, yellow in back. By Chris Wade. March 01, 2015 10:44 AM. ... sometimes the background veers toward a sickly green, ...