Examine source code of dark soul

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Midnight Express",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(27, 38, 59)",
      "toolbar_text": "rgb(224, 225, 221)",
      "frame": "rgb(13, 27, 42)",
      "tab_background_text": "rgb(224, 225, 221)",
      "toolbar_field": "rgb(13, 27, 42)",
      "toolbar_field_text": "rgb(224, 225, 221)",
      "tab_line": "rgb(49, 59, 81)",
      "popup": "rgb(27, 38, 59)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(69, 88, 106)",
      "button_background_hover": "rgba(69, 88, 106, 0.34)",
      "icons": "rgb(224, 225, 221)",
      "ntp_background": "rgb(20, 29, 38)",
      "ntp_text": "rgb(224, 225, 221)",
      "popup_border": "rgb(13, 27, 42)",
      "popup_highlight_text": "rgb(224, 225, 221)",
      "popup_highlight": "rgb(19, 35, 64)",
      "sidebar_border": "rgb(27, 38, 59)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(69, 88, 106)",
      "sidebar_text": "rgb(224, 225, 221)",
      "sidebar": "rgb(27, 38, 59)",
      "tab_text": "rgb(253, 255, 247)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgb(32, 131, 163)",
      "toolbar_field_border": "rgb(48, 56, 72)",
      "toolbar_field_focus": "rgb(13, 27, 42)",
      "toolbar_field_highlight": "rgb(41, 66, 107)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(27, 38, 59)",
      "tab_loading": "rgb(49, 59, 81)"
    }
  }
}