Examine source code of Nihon flag

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nihon flag",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(195, 85, 48, 0.8)",
      "toolbar_text": "rgb(253, 255, 77)",
      "frame": "rgb(0, 150, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(236, 229, 225)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(253, 255, 77)",
      "popup": "rgb(236, 226, 222)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(187, 25, 25)",
      "icons": "rgb(253, 255, 77)",
      "tab_loading": "rgb(253, 255, 77)"
    }
  }
}