Examine source code of Dark Contrast Patern

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Contrast Patern",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-016-0cce7a5c7842040fcc0e297a42678307.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(180, 180, 180)",
      "frame": "rgb(5, 5, 5)",
      "tab_background_text": "rgb(120, 120, 120)",
      "toolbar_field": "rgba(0, 0, 0, 0.35)",
      "toolbar_field_text": "rgb(180, 180, 180)",
      "tab_line": "rgb(180, 180, 180)",
      "popup": "rgb(20, 20, 20)",
      "popup_text": "rgb(180, 180, 180)",
      "tab_loading": "rgb(180, 180, 180)"
    }
  }
}