How can I remove space (margin) above HTML header?

Question

I am creating a website.

I have written the HTML part and now I am writing the stylesheet. But there is always some space above my header. How can I remove it?

Answer 1

This css allowed chrome and firefox to render all other elements on my page normally and remove the margin above my h1 tag. Also, as a page is resized em can work better than px.

h1 {
  margin-top: -.3em;
  margin-bottom: 0em;
}