Add changes regarding issue #68092

[ronakganatra9]

What?

This PR will add necessary core styles to the BlockCanvas for the storybook project as discussed on #67048
and merged
https://github.com/WordPress/gutenberg/blob/trunk/platform-docs/docs/intro.md

Why?

To fix the story box component

How?

Added necessary styles as mentioned in the documenation

Testing Instructions

Find screenshot below.

Testing Instructions for Keyboard

Screenshots or screencast

Before Screenshot:

After Screenshot:

Before	After

[github-actions]

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[github-actions]

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[stokesman]

Thanks for the PR! I’ve yet to test this but noticed a couple things I think should be changed.

[Mamaduka]

The changes in this file are unrelated to the issue. Let's remove them.

[ronakganatra9]

I didn't make any changes in this files, may be any autofixer like eslint or something ? Also, It removed additional spaces so it is good. Do you want me to add extra space again and re-commit the changes ?

[stokesman]

It’s showing up as part of this commit 904dd87. Maybe that was a merge of trunk into this branch? The file is already that way on trunk so it should not be showing up in the diff here anyway. I’ve seen GitHub do some strange stuff like this every once in a while and it be resolved after another push. You might try a amending one of the commit messages and then force pushing.