fix: APP-299 fix mobile padding on PostFilesPublic map

[blushi]

Description

https://regennetwork.atlassian.net/browse/APP-299

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How to test

https://deploy-preview-2456--regen-marketplace.netlify.app/post/regen:13toVgcBUmHqa4uQDjdmVkoEP9DEjnsiZmTS4B4zU1ZLb5Fpt7vnoNq.rdf

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• confirmed all author checklist items have been addressed
• reviewed code correctness and readability
• verified React components follow DRY principles
• reviewed documentation is accurate
• reviewed tests
• manually tested (if applicable)

[netlify]

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[blushi]

You can test this on https://deploy-preview-2456--regen-marketplace.netlify.app/post/regen:13toVgcBUmHqa4uQDjdmVkoEP9DEjnsiZmTS4B4zU1ZLb5Fpt7vnoNq.rdf @erikalogie

[erikalogie]

LGTM!!!