Examine source code of Night Theme

{
  "name": "Night Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "index.jpg"
    },
    "colors": {
      "frame": "rgba(17, 17, 17, 1)",
      "tab_background_text": "rgba(100, 100, 100, 1)",
      "toolbar": "rgba(10, 10, 10, 1)",
      "bookmark_text": "rgba(100, 100, 100, 1)",
      "toolbar_field": "rgba(17, 17, 17, 1)",
      "toolbar_field_text": "rgba(170, 170, 170, 1)"
    }
  }
}