Steps to reproduce

1. Log in to back office.
2. Go to Admin / Content structure.
3. Start creating a new LP content or edit existing one.
4. Add to page builder 'Embed' block.
5. Go to configuration of this block.
6. Click on 'Submit' button (do not add any files to the block).
7. Verify padding between 'Select content' button and validation message. 

Actual result:

Lack of padding between button and validation message.

Expected result:

Correct padding.