📝 Provide a description of the improvement

1. Margin on editable should be set to 0. Without it, some non-fullscreen styling can accidentally influence the fullscreen layout. In https://ckeditor.com/docs/ckeditor5/latest/examples/builds-custom/collaborative-document-editor.html, the top and right margins are too big.

Actual:

Expected:

2. Max-width should also be specified for the same reasons. In https://ckeditor.com/docs/ckeditor5/latest/examples/builds-custom/collaborative-document-editor.html (again) editable has a max-width hardcoded to 210mm and box-sizing: border-box set which doesn't take into account 2px for border and making the editable in fullscreen 2px smaller than in e.g. https://ckeditor.com/docs/ckeditor5/latest/examples/builds-custom/full-featured-editor.html.

📃 Other details

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