Examine source code of Gentle Gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gentle Gray",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(109, 153, 171, 0.5)",
      "bookmark_text": "rgb(241, 247, 251)",
      "frame": "rgb(156, 185, 195)",
      "tab_background_text": "rgb(9, 51, 59)",
      "toolbar_field": "rgb(213, 237, 245)",
      "toolbar_field_text": "rgb(9, 92, 123)",
      "tab_line": "rgb(219, 236, 240)",
      "popup": "rgb(236, 249, 254)",
      "popup_text": "rgb(9, 58, 69)",
      "tab_loading": "rgb(219, 236, 240)"
    }
  }
}