Examine source code of joyful

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "joy",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-045-3e6898966e6ccdc87f80d23d4e7a6a49.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(7, 50, 84)",
      "toolbar_text": "rgb(82, 228, 255)",
      "frame": "rgb(14, 41, 65)",
      "tab_background_text": "rgb(90, 210, 208)",
      "toolbar_field": "rgb(29, 58, 89)",
      "toolbar_field_text": "rgb(198, 203, 255)",
      "tab_line": "rgb(197, 100, 221)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(94, 255, 235)",
      "tab_loading": "rgb(197, 100, 221)"
    }
  }
}