How can I hide login button from service desk portal?

[suzanneabate]

I've seen already that Atlassian doesn't provide a native way to turn off / hide the login button from a service desk portal page, but wondering if anybody here knows of an add on or hack to do this for JSD Cloud? I saw one extension but only for hosted versions. 

In short, we want to keep our support page as simple as possible and we're concerned that customers will be distracted / confused by the login button in the top right. 

Appreciate all your ideas folkx!