Thread:Project:Support desk/Need to replace redirect file File:Redirect arrow without text.svg

I need to locate System Message page or the file within the MediaWiki program that has the Redirect arrow which is displayed on all redirect pages. I have a black .css themed wiki and the redirect file which I think is which shows up  and I would like to replace it with. I've asked this question before but either missed the answer or didn't have any. Any help would be greatly appreciated. Thank you