fix: grid examples

[gui-santos]

Purpose of PR

The grid examples were not showing up because they didn't have a width

PR Checklist

• I have read the relevant readme.md file(s)
• All commits follow our Git commit message convention
• Tests are added/updated/not required
• Tests are passing
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• Usage notes are added/updated/not required
• Has been tested based on Contentful's browser support
• Doesn't contain any sensitive information

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Latest commit: f820e4f

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