Why isn't the border and background color going all the way to the sides?

[gtrman97]

KKmGVQG

I want to have the border go all the way to the sides and have the background color completely fill the header with no white space.

[MrBondx]

You can set the margin of the body to zero. Im not sure I understand your other requirement.

[seekinfox]

Hi.
Try and follow →

html, body {
 margin:0;  /*will remove the margin*/
}
h2 {
 margin-top: 0; /*remove top-margin (white space above your element)*/
}

[blaze-12]

set the margin to be zero pixels auto or try doing justify-content : center;