This theme has a versatile header that can be fixed, animated on scroll, transparent (over images and backgrounds) and inverted.

# config.yml

  fixed: true
  header_height: '60px'
  header_menu_font_size: '18px'

Transparent header

If you want the header to be transparent over the top of an image or background color add header_transparent: true to a pages front-matter.

# pages/services.md
title: 'Services'

header_transparent: true