Examine source code of Hanguang-jun winter theme

{
  "name": "Hanguang-jun winter theme",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "ultimo.jpg"
    },
    "colors": {
      "frame": "rgba(92, 114, 161, 1)",
      "tab_background_text": "rgba(0, 0, 0, 0.83)",
      "toolbar": "rgba(255, 255, 255, 0.11)",
      "bookmark_text": "rgba(66, 63, 82, 1)",
      "toolbar_field": "rgba(242, 242, 242, 0.83)",
      "toolbar_field_text": "rgba(86, 111, 125, 0.89)"
    }
  }
}