There's only a limited amount of customization that is possible from within the SSL-Explorer interface and that relates to adding a logo and text to the logon page.

For further customization this is manual and not officially supported. Look for CSS files in the sslexplorer\webapp\theme\default directory, you should be able to see settings that affect global colours etc in there.

You will also see image files under the same theme directory if images need to be replaced.

There is something else which can be looked at for a quick fix to alter some colours, but please note that this may not be fully supported any more even though the entries are still there.

If you look at the sslexplorer/conf/system.properties, you will find a lot of entries starting with:

#sslexplorer.defaultTheme.

If you uncomment all these lines, you end up with a mostly green looking theme, so you could get an idea if changing any of those values might do what you require.