Examine source code of Geo Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Geo Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(32, 32, 32)",
      "toolbar_text": "rgb(234, 234, 234)",
      "frame": "rgb(13, 13, 13)",
      "tab_background_text": "rgb(202, 202, 202)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(171, 22, 22)",
      "popup": "rgb(23, 23, 23)",
      "popup_text": "rgb(241, 241, 241)",
      "button_background_hover": "rgb(79, 79, 79)",
      "ntp_text": "rgb(233, 233, 233)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgba(74, 74, 74, 0.74)",
      "toolbar_field_highlight": "rgb(0, 120, 215)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "tab_loading": "rgb(171, 22, 22)"
    }
  }
}