Examine source code of Nature Gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nature Gray",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(105, 135, 105)",
      "toolbar_text": "rgb(22, 39, 22)",
      "frame": "rgb(160, 182, 160)",
      "tab_background_text": "rgb(14, 24, 14)",
      "toolbar_field": "rgb(22, 39, 22)",
      "toolbar_field_text": "rgb(244, 244, 244)",
      "tab_line": "rgb(121, 255, 0)",
      "popup": "rgb(160, 182, 160)",
      "popup_text": "rgb(22, 39, 22)",
      "ntp_background": "rgb(60, 78, 60)",
      "ntp_text": "rgb(244, 244, 244)",
      "popup_highlight_text": "rgb(121, 255, 0)",
      "toolbar_field_highlight_text": "rgb(173, 255, 173)",
      "toolbar_field_highlight": "rgb(22, 39, 22)",
      "tab_loading": "rgb(121, 255, 0)"
    }
  }
}