Examine source code of A simple gray theme

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Grey Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(224, 224, 224, 0.68)",
      "toolbar_field": "rgb(200, 200, 200)",
      "toolbar_field_text": "rgb(35, 35, 35)",
      "tab_line": "rgb(203, 203, 203)",
      "popup": "rgb(240, 240, 240)",
      "popup_text": "rgb(56, 56, 56)",
      "tab_loading": "rgb(203, 203, 203)",
      "bookmark_text": "rgb(77, 77, 77)",
      "frame": "rgb(180, 180, 180)",
      "tab_background_text": "rgb(60, 60, 60)"
    }
  }
}