@creedon thanks for trying to help me troubleshoot this!
So I went to that Header Code injection setting, but it's actually blank.
I did, however, take a look at the html code I'd used for the text animation, and saw that this ".container" line was in there. So I removed that from the code, and sure enough...it did remove that border!!
BUT it also made my "Let's talk" button jump up and down with the animated text every time the text types on and off. Which is not great.
Any other thoughts?
I could attach screenshots of the code if that would help.