Examine source code of GameCube Controller

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gamecube Controller 2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(130, 59, 234, 0)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(103, 66, 191)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(215, 215, 215)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(103, 66, 191)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(46, 215, 0, 0.72)",
      "button_background_hover": "rgb(232, 0, 50)",
      "icons_attention": "rgba(255, 214, 0, 0.92)",
      "tab_background_separator": "rgb(60, 0, 130)",
      "toolbar_bottom_separator": "rgb(60, 0, 130)",
      "toolbar_field_border_focus": "rgb(60, 0, 130)",
      "toolbar_field_border": "rgb(60, 0, 130)",
      "toolbar_field_separator": "rgb(60, 0, 130)",
      "toolbar_top_separator": "rgb(60, 0, 130)",
      "toolbar_vertical_separator": "rgb(60, 0, 130)",
      "tab_loading": "rgb(103, 66, 191)"
    }
  }
}