Redline appears on my page :(

[YUEH-JUNG_LU]

Hello all,

my webpage is showing redline on the left across multiple pages. Can anyone tell me what that is and most importantly who to fix it?

Thank you a lot.

https://preview.webflow.com/preview/jyl-design?utm_medium=preview_link&utm_source=designer&utm_content=jyl-design&preview=467962f85a5719c718515345cb1e8641&locale=en&workflow=preview

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Here is my site Read-Only: LINK
(how to share your site Read-Only link)

[memetican (Michael Wells)]

You have a border on your section.