Fix the issue: Content overlaps the "close" button

[dmytro-ch]

Description (*)

The confirmation popups are broken due to the reduced width.
Looks like the expected width is 50rem. This rule has been added by the following commit: 2f133c8
In this case, we just need to resolve the issue related to content overlapping the "close" button.

Fixed Issues (if relevant)

1. Broken backend popup view #19263: Broken backend popup view

Manual testing scenarios (*)

Affected functionality: The confirmation popups in admin panel.

1. Login to admin panel.
2. Go to System -> Cache Management.
3. Click "Flush Cache Storage".

Expected result

1. Content does not overlap the "close" button. (including tablet and mobile view);

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

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[rogyar]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @rogyar. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @rogyar, here is your Magento instance.
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Login: admin Password: 123123q
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[rogyar]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @rogyar. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @rogyar, here is your new Magento instance.
Admin access: http://34.228.235.121/pr-19264//admin
Login: admin Password: 123123q

[ishakhsuvarov]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @ishakhsuvarov. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @ishakhsuvarov, here is your new Magento instance.
Admin access: https://pr-19264.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.