Steps to replicate the issue (include links if applicable):

• Navigate to the page: https://test.wikipedia.org/wiki/User:A.H19051890/Sandbox2
• Observe the "Editing" notice box displayed on the page.

What happens?:

• The text inside the box ("Hello. You're editing the userpage of ExampleUser. Please make your edits friendly, as this is a userpage and is only supposed to be edited by the user!") overflows the right boundary of the container instead of wrapping to the next line.

What should have happened instead?:

• The text should automatically wrap within the container boundaries and remain properly padded inside the box borders.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):
(Skip)
Other information (browser name/version, screenshots, etc.):

• Attached screenshot showing the text overflow bug.
• Suggested Fix: Add overflow-wrap: anywhere; or word-break: break-word; to the CSS styling of the notice box text element.