Examine source code of Brown Copper Maze

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Brown Copper Maze",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(153, 92, 41)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(167, 113, 71)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(41, 87, 163)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(78, 150, 255)",
      "popup": "rgb(167, 113, 71)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(78, 150, 255)"
    }
  }
}