Examine source code of Porco Rosso Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Porco theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center",
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(88, 124, 124, 0.48)",
      "toolbar_text": "rgb(247, 251, 251)",
      "frame": "rgb(79, 81, 81)",
      "tab_background_text": "rgb(244, 248, 247)",
      "toolbar_field": "rgba(51, 89, 89, 0.63)",
      "toolbar_field_text": "rgb(241, 245, 245)",
      "tab_line": "rgb(232, 240, 236)",
      "popup": "rgb(59, 93, 93)",
      "popup_text": "rgb(242, 247, 244)",
      "tab_loading": "rgb(232, 240, 236)"
    }
  }
}