Examine source code of Gray World

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gray World",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-028-5466583598afcc175c90e35aceb1246b.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(244, 245, 249, 0.59)",
      "toolbar_text": "rgb(11, 11, 11)",
      "frame": "rgb(69, 59, 78)",
      "tab_background_text": "rgb(245, 249, 249)",
      "toolbar_field": "rgb(234, 234, 234)",
      "toolbar_field_text": "rgb(11, 11, 11)",
      "tab_line": "rgb(97, 115, 91)",
      "popup": "rgb(206, 203, 207)",
      "popup_text": "rgb(17, 7, 7)",
      "tab_loading": "rgb(97, 115, 91)"
    }
  }
}