[PS 1.7.8.1] How to make a background from a photo for the entire page?

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I started learning how to edit a theme, I wanted to ask how it was done that there is a photo on this page on the entire page https://ets-demos.com/theme/kidshop/en/ and only in my body https://prezentownia.online/pl/ in css / theme.css I have this code

main {
  background-image: url(../img/top_left.png), url(../img/top_right.png), url(../img/bg.gif);
  background-repeat: no-repeat, no-repeat, repeat;
  background-position: top left, top right, center;
}

 

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[manuel987]

you know how to inspect a webpage ? Or using developer tools ?

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29 minutes ago, manuel987 said:

you know how to inspect a webpage ? Or using developer tools ?

I think yes but i can't find the answer