Changed min width of parent grid to be smaller

[lamATnginx]

Proposed changes

Better support mobile devices by making min width zero.

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• I have read the CONTRIBUTING document
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[danielledeleo]

Think we can tack on general padding changes (mobile only) onto this PR? On mobile we can reclaim that extra gutter space. Though it's probably easier to remove the overhanging callouts and shrink the gutter.

Also looks like the breadcrumbs are breaking too early.