Examine source code of BeesinFlower

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Bees",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(32, 60, 103, 0.95)",
      "toolbar_text": "rgb(136, 184, 194)",
      "frame": "rgb(197, 194, 118)",
      "tab_background_text": "rgb(219, 225, 232)",
      "toolbar_field": "rgba(241, 251, 205, 0.95)",
      "toolbar_field_text": "rgb(1, 4, 5)",
      "tab_line": "rgb(243, 241, 234)",
      "popup": "rgb(211, 233, 235)",
      "popup_text": "rgb(3, 7, 0)",
      "tab_loading": "rgb(243, 241, 234)"
    }
  }
}