Google Contacts Preview and Gmail

If you switched to the new Google Contacts interface and select Contacts from the Gmail dropdown, you'll no longer see the old Google Contacts. Google will open the Contacts preview in a new tab and not inside Gmail, which doesn't use Material Design yet.

You can switch back to the old Contacts by clicking "Leave the Contacts preview" in the "More" menu. Another option is to use this permalink for the old Google Contacts: https://mail.google.com/mail/#contacts or this keyboard shortcut: press g then c in Gmail (assuming that keyboard shortcuts are enabled).