Examine source code of Bloody Nightmare

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blood Nightmare",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-023-e85e76c500c0fbb9e5dd512e1d1ca158.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(4, 26, 35)",
      "toolbar_text": "rgb(188, 11, 13)",
      "frame": "rgb(49, 56, 61)",
      "tab_background_text": "rgb(211, 200, 200)",
      "toolbar_field": "rgb(107, 16, 25)",
      "toolbar_field_text": "rgb(229, 225, 239)",
      "tab_line": "rgb(239, 143, 45)",
      "popup": "rgb(88, 1, 3)",
      "popup_text": "rgb(254, 210, 210)",
      "tab_loading": "rgb(239, 143, 45)"
    }
  }
}