Examine source code of Empty continent.

{
  "theme": {
    "images": {
      "theme_frame": "0103-akarui-tairiku.jpg"
    },
    "colors": {
      "frame": "#f2eded",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Empty continent.",
  "manifest_version": 2,
  "description": "大陸・空。\n\n\n\n\n0103-akarui-tairiku-●"
}