Examine source code of Portale2019

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Portale2019",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(184, 187, 187)",
      "toolbar_text": "rgb(250, 4, 8)",
      "frame": "rgb(8, 4, 101)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(18, 92, 2)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(141, 2, 3)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  }
}