Examine source code of Space by Doodle

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Space by Doodle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0.33)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(104, 6, 136, 0.31)",
      "toolbar_field_text": "rgb(251, 251, 251)",
      "tab_line": "rgb(104, 6, 136)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(139, 7, 183)",
      "tab_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(104, 6, 136)"
    }
  }
}