Examine source code of Night Circus

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Night Circus",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(226, 35, 7, 0.61)",
      "toolbar_text": "rgb(32, 192, 129)",
      "frame": "rgb(14, 19, 124)",
      "tab_background_text": "rgb(197, 207, 45)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(225, 216, 156)",
      "tab_line": "rgb(12, 2, 4)",
      "popup": "rgb(21, 224, 187)",
      "popup_text": "rgb(12, 2, 4)",
      "tab_loading": "rgb(12, 2, 4)"
    }
  }
}