Examine source code of music notes2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "musicnotes2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(21, 20, 21, 0.32)",
      "toolbar_text": "rgb(43, 255, 5)",
      "frame": "rgb(23, 101, 145)",
      "tab_background_text": "rgb(255, 45, 8)",
      "toolbar_field": "rgba(16, 16, 15, 0.06)",
      "toolbar_field_text": "rgb(55, 65, 255)",
      "tab_line": "rgb(252, 255, 0)",
      "popup": "rgb(16, 15, 15)",
      "popup_text": "rgb(255, 45, 8)",
      "tab_loading": "rgb(252, 255, 0)"
    }
  }
}