Change Background color for new Tab UI

I wanted to change the background color only when I was editing, so I plugged the following in CSS Snippet

.markdown-source-view   {
	background-color: rgb(247, 246, 246);

It is very comfortable, but I would like to change the color here too in the attachment, but I just can’t change it here.

I tried this and it changed the overall color at the top,


but I only want to change the current tab area.

Do you know what I should do?

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