Examine source code of Balanced Dark Mode

{
  "name": "Balanced Dark Mode",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "transparant.png"
    },
    "colors": {
      "frame": "rgba(16, 16, 16, 1)",
      "tab_background_text": "rgba(186, 186, 183, 1)",
      "toolbar": "rgba(39, 39, 39, 1)",
      "bookmark_text": "rgba(186, 186, 183, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(39, 39, 39, 1)",
      "tab_line": "rgba(158, 90, 90, 0)"
    }
  }
}