(Refer back to my post on "Setting up the SASTheme_winter in SAS Portal" to get the initial files loaded in the servlet container.)
I have found that by modifying the following stylesheets and HTML files, I can get the new theme banner to meet the web design requirements.
themes\SAS\Themes.xml
themes\theme_name\stylesPortal.css
themes\theme_name\stylessasStyle.css
themes\theme_name\templatesBanner.html