Examine source code of NightV1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "NightV1",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(17, 17, 17)",
      "toolbar_text": "rgb(172, 172, 172)",
      "frame": "rgb(21, 21, 21)",
      "tab_background_text": "rgb(101, 101, 101)",
      "toolbar_field": "rgb(25, 25, 25)",
      "toolbar_field_text": "rgb(204, 204, 204)",
      "tab_line": "rgb(153, 17, 17)",
      "popup": "rgb(153, 153, 153)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(153, 17, 17)"
    }
  }
}