Examine source code of Dark Theme

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Dark Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(75, 84, 99)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(33, 36, 40)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(61, 67, 78)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(126, 138, 154)",
      "popup": "rgb(41, 42, 45)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(89, 97, 111)",
      "icons_attention": "rgb(108, 150, 236)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(75, 84, 99)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(60, 64, 67)",
      "sidebar_border": "rgb(62, 62, 62)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(75, 84, 99)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(75, 84, 99)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(62, 62, 62)",
      "toolbar_field_border_focus": "rgb(51, 52, 57)",
      "toolbar_field_border": "rgb(61, 67, 78)",
      "toolbar_field_focus": "rgb(32, 33, 36)",
      "toolbar_field_highlight": "rgb(24, 90, 188)",
      "toolbar_field_separator": "rgba(255, 255, 255, 0)",
      "toolbar_top_separator": "rgb(33, 36, 40)"
    }
  }
}