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Custom js code not fully working

I am preparing my portfolio and want to insert an animation created by javascript on the landing section.
I inserted the customized code through the code embed component on the landing section

but it always appears on the bottom section of the page, never the place I want it to be.
plus it shows the following error:
Failed to load resource: the server responded with a status of 403 ()

I can see the code visual working just fine, but the location is not right, and I cant fix it.
Does anybody have an idea what I should do?
Thank you!!

here is the link
it’s still a draft