How to use z-index:-1 to make a layer below all layers as a background

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Method to have a layer below all layers as background: z-index:-1

To make z-index less than 0

The code is as follows:

img

{

position:absolute;

left:0px;

top:0px;

z-index:-1;

}

This is a heading

Since the z-index of the image is-1, it appears after the text.

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