try u:gold / p:gold
worked for me.
da real mvp
This no longer works, unfortunately.
Was good while it lasted. Maybe there should be a policy regrading sites that require passwords posted on DN.
staging still works https://uikit.staging.service.gov.au/
....I was so much looking forward to opening this and it asked me for password.
As Doug Orchard mentioned: Use "gold" for both the username and password.
I like how they broke down each module with "Overview, Rationale, Accessibility, and Code"
Asked me for password 
Go to staging and u: gold pw: gold still works https://uikit.staging.service.gov.au/
Username/password no longer working. Receiving the following message:
We’ve recently placed the Design System documentation site back behind a password-protection mechanism - thanks for all of the early responses and retweets we’ve received to date. The internal and external feedback has been enormously useful - we’ve got some more work to do to prepare for our approach to a public launch. We look forward to sharing the next release as publicly as possible, as soon as possible. In the meantime, we’ll be reading and responding (when possible) to posts in this forum, and the UI-Kit v2 GitHub repo is as active as ever.
GitHub repo goes here: https://github.com/govau/uikit
Cool password wall!
Anyone else getting a 404? We may have hugged it to death
OMG the same! does anyone tried 'qwerty' ?