How to solve the problem that z-index does not work when div does not set color

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In fact, when we change two div of different colors to set their position,top,left, we can see that one is the same as on the other, but when the div does not set the color, we can see that it seems to overlap, and no one covers the other. Z-index doesn't seem to work. Why?

The answer is: no color is set, it is estimated that the default is tranaparent, so that's it, so we can set a color to the one above, if you really don't want it.

We can set it to # fff so that their color (actually rgb) is different, and we can see one overlaying the other.

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