Examine source code of Mario's Custom Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mario's Custom Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-044-d348b7b42f4790e561202cad5e15d3e6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(54, 180, 255, 0.58)",
      "toolbar_text": "rgb(77, 77, 77)",
      "frame": "rgb(100, 198, 255)",
      "tab_background_text": "rgb(66, 66, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.48)",
      "toolbar_field_text": "rgb(0, 1, 184)",
      "tab_line": "rgb(255, 0, 29)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 1, 184)",
      "tab_loading": "rgb(255, 0, 29)"
    }
  }
}