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Why is there a faint pink line around my header text

As you can see, my header text has this weird pink border around the text. I tried different fonts and colors, doesn’t matter. I tried deleting all the H1 elements around my site and adding them again, same thing. I tried adding a shadow to cancel it out, it was there inside the shadow.

Edit: I’m not using this design anymore so my public share link is irrelevant, but I’d still be curious to know why this happened & how it could be fixed.

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