I'm not sure this is what you are looking for, but go to design view, select the button, in the toolbar select Format, then look at Quick Styles and Shape Effects. You can change the color under Shape Fill.

If you would like to make custom buttons, check out this video: Transparent Buttons

Those options are not available when I click the button and go to Format on this database. This menu is a copy from another database. I have all of those options on the original. I hope that helps explain the issue better. I appreciate any help you can provide. Thanks Sandra!