Examine source code of cityscape2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cityscape2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(79, 75, 142, 0.31)",
      "toolbar_text": "rgb(22, 255, 18)",
      "frame": "rgb(17, 1, 2)",
      "tab_background_text": "rgb(22, 255, 18)",
      "toolbar_field": "rgba(79, 75, 142, 0.09)",
      "toolbar_field_text": "rgb(22, 255, 18)",
      "tab_line": "rgb(255, 85, 18)",
      "popup": "rgb(17, 1, 2)",
      "popup_text": "rgb(126, 126, 214)",
      "tab_loading": "rgb(255, 85, 18)"
    }
  }
}