Update max-width of main content

[timwlee]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--{repo}--{owner}.aem.live/
• After: https://--{repo}--{owner}.aem.live/

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Commits

• 8ae9f8c ✅ (latest)