How to make an image background? - HTML CSS

How can I make an image background like these https://codepen.io/freeCodeCamp/full/VPaoNP

putting the elements that I already have on top of the image

If you’re linking to a URL

body {
  background-image: url("#");
}

A file on your computer

body {
  background-image: image(/*path goes here*/);
}
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