White Space Header and Footer

[svrdoljak123]

Hi, I have a question regarding the white space under the header and footer. Where can I remove it, I have tried CSS, and HTML it's nowhere to be found. When I deactivate the theme it disappears. Thank you. I Have changed nothing and added nothing to the theme CSS.

[superhelten]

.site-title {
Margin: 0;
}

.site-branding {
Margin: 0 auto;
}

main {
margin: 0 auto;
}

[alemacielsilva]

.site-title { Margem: 0; }

.site-branding { Margem: 0 auto; }

main { margem: 0 auto; }

It doesn't work.