title: How to set margin top for header?
body: <p>The <code>--margin-top</code> option is for the contents margin, but I would like to set the margin from the top of the page to the header. The project I'm working on allows users to create header and footer themselves, so the height of the header or footer is dynamic. </p>
  
  <p>I don't know how to do it so can anyone help?</p>