Examine source code of NightlyCustomization

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "NightlyCustomization",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-014-1586da559b26f11cd37804ee9347a16b.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(18, 23, 78)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(207, 22, 32)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 0, 37)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 255, 13)",
      "popup": "rgb(26, 161, 211)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 255, 13)"
    }
  }
}