If you want to see more of the image on your My Yahoo! Page Background, set the Background Color for the Content Body to be transparent by following these steps:

1. Open the page you want to change by clicking its tab name.
2. Click the Themes button.
3. Click Customize Theme.
4. Click on the Content Body area of the My Yahoo! page diagram. (That's the part with the words Text, Links, and Visited Links inside.)
5. In the Content Body palette that opens, click the Make See-through checkbox (under Background) so that a check mark appears.
6. When you are satisfied with your changes, click I'm Done.

Your change affects only the tab you're viewing. Each tab can have its own theme.