Examine source code of Lightrail Epic

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "lightrail epic",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(5, 7, 66, 0.78)",
      "toolbar_text": "rgb(236, 236, 236)",
      "frame": "rgb(13, 7, 42)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(42, 8, 5, 0.52)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(1, 1, 13, 0.39)",
      "popup": "rgba(22, 14, 87, 0.62)",
      "popup_text": "rgb(255, 237, 232)",
      "ntp_background": "rgba(26, 10, 79, 0.89)",
      "tab_background_separator": "rgba(113, 121, 221, 0)",
      "tab_selected": "rgba(113, 121, 221, 0)",
      "toolbar_top_separator": "rgba(42, 30, 144, 0.96)",
      "toolbar_vertical_separator": "rgba(160, 203, 252, 0.61)",
      "tab_loading": "rgba(1, 1, 13, 0.39)"
    }
  }
}