If you want to add spacing to the top of ALL islands in the portal so that the hovering titlebar on an island overlaps any potential content, you can add the downloadable .CSS file on this article to your current theme's folder.
Normally the path the the folder of your current theme will be similar to:
Drive:\inetpub\wwwroot\Production Portal\App_Themes\**Your Theme Name**\
The folder you'll drop this file into should have a name very similar to the theme's name in your portal.
Once added it should start adding space on island title bars as soon as you refresh the page!