fix hamburger z-index

[bdougie]

Description

I think I messed this up when I was triaging for #260

Related Tickets & Documents

fixes #265

Mobile & Desktop Screenshots/Recordings

Steps to QA

1. Open mobile view
2. open hamburger menu

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [x] Tier 4

[optional] Are there any post-deployment tasks we need to perform?

[optional] What gif best describes this PR or how it makes you feel?

[netlify[bot]]

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[bdougie]

Can you test this @Stephen-254; when the netlify deploy preview finishes?