Examine source code of Perfect Dark Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Perfect Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(50, 50, 50)",
      "toolbar_text": "rgb(204, 204, 204)",
      "frame": "rgb(50, 50, 50)",
      "tab_background_text": "rgb(204, 204, 204)",
      "toolbar_field": "rgb(35, 35, 35)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(0, 0, 0, 0.75)",
      "popup": "rgb(50, 50, 50)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(50, 50, 50)",
      "popup_border": "rgb(50, 50, 50)",
      "sidebar_border": "rgb(50, 50, 50)",
      "sidebar_highlight": "rgb(36, 36, 36)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(50, 50, 50)",
      "tab_selected": "rgb(84, 84, 84)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(17, 17, 17)",
      "tab_loading": "rgba(0, 0, 0, 0.75)"
    }
  }
}