Product feedback: Multi Instance - Ability to distinguish admin centers

We are an enterprise customer and managing 25+ different Zendesk instances. In the Support UI we have the possibility to set our many systems apart, e.g. with the sidebar in different color. In the new Admin Center, that unfortunately opens in a different browser tab, all our instances look alike. The only way to tell which admin center you are working on, is the URL. 

Previously having the admin pages integrated into the UI, it was more convenient. Would you please do something to make our lives easier telling apart the admin centers. E.g. simply take over the side bar color of the UI. 

Thanks, Patrizia