I had been wondering about the z-index. I know there is all this positioning stuff - but what is the z-index?

As it turns out the default z-index of an image is 0, so as soon as you turn it this into a negative you reduce its priority. This means that you can use your image as a background!

But you have to make sure that you position the element - i.e. absolutely or relatively.

I’ll try and demonstrate here:

here is where I start to write all over them!

vu