Examine source code of doodle header

{
  "theme": {
    "images": {
      "theme_frame": "headerrr.png"
    },
    "colors": {
      "frame": "#302b2b",
      "tab_background_text": "#211f1f"
    }
  },
  "version": "2.0",
  "name": "doodle header",
  "manifest_version": 2,
  "description": "header made from brushes"
}