How to remove unwanted lines of code from landing page

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I've recently used the tutorial on how to add an age verification to your page. While following this turtorial I was required to add a snippet in the body section. When you go to my website's ;anding page, there is now a single line of code at the very top. I'm not sure what I've done to cause this, and I can not seem to locate the error. Any help with this would be appreciatted.