Examine source code of Big sur (dark pro)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Big sur",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(89, 107, 107, 0)",
      "toolbar_text": "rgb(81, 140, 182)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0.36)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(80, 142, 183)",
      "popup": "rgba(27, 40, 45, 0.42)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgba(10, 21, 21, 0)",
      "tab_loading": "rgb(80, 142, 183)"
    }
  }
}