Examine source code of Retro Indigo

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Retro Indigo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-018-0ca3dfc7bb661ec53999d358812ce0ab.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(47, 46, 48, 0.85)",
      "toolbar_text": "rgb(245, 243, 243)",
      "frame": "rgb(225, 225, 225)",
      "tab_background_text": "rgb(151, 78, 199)",
      "toolbar_field": "rgb(238, 237, 240)",
      "toolbar_field_text": "rgb(47, 46, 48)",
      "tab_line": "rgb(235, 68, 13)",
      "popup": "rgb(151, 78, 199)",
      "popup_text": "rgb(238, 237, 240)",
      "tab_loading": "rgb(235, 68, 13)"
    }
  }
}