[FRONTEND] Make the loader a higher z index than the full page background

[bcho892]

Is your feature request related to a problem? Please describe.

[!NOTE] There is a chance that this is not the problem - explore if it is

When the register chunk is being fetched it seems like there is no loader being displayed even though all chunks should be using it.

BEFORE MERGING

• [ ] Storybooks created where possible
• [ ] Tested with nock if data fetching
• [ ] Tests written for critical interactions
• [ ] PR Reviewed (For non-trivial changes)
• [ ] Changes tested after rebasing on master or merging in master (hint: git fetch origin master:master, then git rebase master or git merge master)
• [ ] All required PR checks passing

[bcho892]

Not the problem, it can be seen that the loader can appear over the background images in certain cases