Examine source code of nierr

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "nier",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-004-411c27df18d2f86bd8790aa4a1bde85f.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(63, 31, 59)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(20, 23, 25)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(18, 15, 18)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(32, 22, 83)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(91, 0, 112)",
      "icons_attention": "rgba(0, 0, 0, 0.08)",
      "ntp_background": "rgba(255, 255, 255, 0.08)",
      "tab_loading": "rgb(32, 22, 83)"
    }
  }
}