Editing area width fixed with vertical tabs

Closes #3398277

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@Gauravmahlawat I think we need an alternate solution here without making use of width: attic

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• 5086e0fd - Change default to 60rem (960px), use a CSS3 variable to let users override the...

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• ccd0aec5 - Change default to 60rem (960px), use a CSS3 variable to let users override the...

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• fdc53b87 - Change default to 60rem (960px), use a CSS3 variable to let users override the...

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