Examine source code of adwaita-dark-xfce4

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "adwaita-dark-xfce4",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(51, 57, 59)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(35, 39, 41)",
      "tab_line": "rgb(33, 93, 156)",
      "popup": "rgb(51, 57, 59)",
      "popup_text": "rgb(253, 253, 253)",
      "tab_loading": "rgb(33, 93, 156)",
      "bookmark_text": "rgb(255, 255, 255)",
      "frame": "rgb(35, 39, 41)",
      "tab_background_text": "rgb(255, 255, 255)"
    }
  }
}