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Template Set Manager »» YourCustomTemplateSet »» system_redirect.html
The CSS is hard coded in system_redirect.html
After you've cloned your default template set, set your new custom template set as active, and set Preferences Main »» General Settings »» "Update module template .html files from themes/your theme/templates directory?" to "Yes", you should be able to edit the template.
After you're done making your changes, make sure you set Preferences Main »» General Settings »» "Update module template .html files from themes/your theme/templates directory?" to "No".
Hope this helps.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.