Maybe In AS test 3 you forgot to remove:
with-curtain from the html.
When you developed the new js code.
In saying that, none of the code that was worked on here had this line in it.
document.querySelector(".container.with-curtain").classList.add("hide");
In saying that, you developed the code somehow without including that line in it.
oh.
You never used: this line in the js of your code.
document.querySelector(".container.with-curtain").classList.add("hide");