I have been making an event site and that is how it looks like on my friends screen

It should look like that

Is there any way I can force it to have same colors like me or not? And why his background is not full screen because I have background code like this

html{
    background-color: red;
}

I think it should fill the whole screen.

CodePudding user response：

Try out this:

*{
    background-color: red;
}

CodePudding user response：

Check the height of the element