BUG Ui Broke when attempting to comment by mentioning someone.

[VineeTagarwaL-code]

Describe the bug Ui seems to be broken , the content overlapped and expanded more than the screen width

To Reproduce Steps to reproduce the behavior:

1. Go to comment on anyone's post
2. try to mention them using '@' , but dont complete the mention
3. Click on the username mentioned in the comment to navigate to their profile page.
4. When attempting to return to the previous page, an error occurs. I have attached a video demonstrating this issue.

Video

https://github.com/twitter/opensource-website/assets/91052168/6a4603b5-9b1e-4826-a7fd-9caa0d5ac160

It shouldn't be overlapping and be normal as expected

Screenshots

Environment

[paulidis]

Same happens on Safari v17.1.2 on MacOS 14.1.2