Can I close my question only the answer remaining on the page that voters could not vote on the post?
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Your question is already closed as a duplicate.
But generally if you like to close a question you can flag it for closure or if you have enough reputation (3k+) you can cast a close vote.
You cannot delete your question if it has answers with positive score.
As the downvote tooltip says, one of the reasons for downvoting is that the question "does not show any research effort". Since your question is a duplicate of another question, it shows that you didn't do significative previous research.
BTW, please refrain from your editing practice of replacing all the content with a one-line comment. It is difficult to see what you had asked before.
Your question is duplicate of css id vs class and already closed .. its always good to do some search hefore posting questiin
And closing doesn't mean that vote on post is locked and also you can not delete closed question