Examine source code of Personal Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Personal Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(51, 51, 51)",
      "toolbar_text": "rgb(82, 133, 179)",
      "frame": "rgb(39, 39, 39)",
      "tab_background_text": "rgb(112, 112, 112)",
      "toolbar_field": "rgb(66, 66, 66)",
      "toolbar_field_text": "rgb(229, 229, 229)",
      "tab_line": "rgb(82, 133, 179)",
      "popup": "rgb(39, 39, 39)",
      "popup_text": "rgb(172, 172, 172)",
      "tab_loading": "rgb(82, 133, 179)"
    }
  }
}