Google Calendar block: lack of space around error notice

[alaczek]

When and invalid embed code is pasted into the Google Calendar Block, the resulting error notice lacks spacing and is misaligned with the content.

Steps to reproduce the issue

1. Add Google Calendar block to a post or a page.
2. Paste any random text in the input field, to invoke the error message. Note the position of the message.

What I expected

For the error message to be aligned with the text, and have adequate vertical spacing.

Screenshots

Found while testing the Google Calendar block.

[apeatling]

I'll take this one.