Examine source code of Deep Theme

{
  "name": "Deep Theme",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "solid-color-image.png"
    },
    "colors": {
      "frame": "rgba(51, 51, 51, 1)",
      "tab_background_text": "rgba(212, 194, 189, 1)",
      "toolbar": "rgba(51, 51, 51, 1)",
      "bookmark_text": "rgba(212, 194, 189, 1)",
      "toolbar_field": "rgba(61, 61, 61, 1)",
      "toolbar_field_text": "rgba(212, 194, 189, 1)",
      "tab_line": "rgba(51, 51, 51, 0)"
    }
  }
}