[CMS] Improving the uploaded images styling view

[eduard13]

Description (*)

This PR fixes the styling issue for uploaded images.

Fixed Issues (if relevant)

1. [CMS] File upload preview style issue #20786: [CMS] File upload preview style issue
2. ...

Manual testing scenarios (*)

1. Open a CMS page or block
2. Click on the Insert Image from the content field
3. Upload a new image or check the existing ones

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 @eduard13. 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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[eduard13]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @eduard13. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @eduard13, here is your new Magento instance.
Admin access: https://pr-20787.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[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: https://pr-20787.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-4051 has been created to process this Pull Request

[ghost]

Hi @eduard13, thank you for your contribution!
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