it might be a default of some extension or your browser. You can remove it by setting the margin, padding and border to 0 in your body tag like:

body {
  border: 0;
  margin: 0;
  padding: 0;
}

I check in other browser, pc`s friends and it stay, i have it and also i added !important but it didn work

do it without the .. You can easily copy exactly what I shared

i tried it before and it show me error

which error? Please share the full error

great a normal .css file and put it there. Then import this new .css file into your page

what?

i import my css in the index

put it inside your globals.css

1. Create a file called global.css if you don't have any yet
2. Put the mentioned code in there
3. Import that global.css into your page

how i can import the global css in my page

like this:

import './globals.css'; // use the path, where your global.css is

I fixed it with chat gpt, it was silly, thank you very much anyway! ♥️

Thank you for your trust in my answers