Examine source code of Simple Light Grey

{
  "name": "Simple White",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2021-08-14 at 01.43.12 copy.png"
    },
    "colors": {
      "frame": "rgba(238, 238, 242, 1)",
      "tab_background_text": "rgba(86, 86, 88, 1)",
      "toolbar": "rgba(248, 248, 250, 1)",
      "bookmark_text": "rgba(81, 81, 91, 1)",
      "toolbar_field": "rgba(238, 238, 242, 1)",
      "toolbar_field_text": "rgba(179, 179, 179, 1)",
      "tab_line": "rgba(248, 248, 250, 1)"
    }
  }
}