Examine source code of betrayal.io

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "betrayal",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(199, 255, 248)",
      "toolbar_text": "rgb(255, 25, 25)",
      "frame": "rgb(82, 65, 91)",
      "tab_background_text": "rgb(6, 255, 0)",
      "toolbar_field": "rgba(55, 227, 23, 0.54)",
      "toolbar_field_text": "rgb(0, 14, 253)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgb(120, 31, 193)",
      "popup_text": "rgb(197, 21, 255)",
      "tab_loading": "rgb(255, 0, 0)"
    }
  }
}