XSS ME | CSS Adjacent Sibling Selectors

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P.S.
This lab isn't specifically designed for XSS. I was just curious to know if we can bypass insertAdjacentHTML restrictions.
This lab is part of another post, which I'll be publishing within a week, may be.
Please let me know if you are able to triggers XSS.

Ref: https://developer.mozilla.org/en/docs/Web/CSS/Adjacent_sibling_selectors