Examine source code of chrome blue colors

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "chrome blue colors",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(145, 168, 208)",
      "toolbar_text": "rgb(37, 35, 37)",
      "frame": "rgb(81, 111, 163)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(134, 161, 207)",
      "toolbar_field_text": "rgb(37, 35, 37)",
      "tab_line": "rgba(52, 79, 134, 0)",
      "popup": "rgb(145, 168, 208)",
      "popup_text": "rgb(37, 35, 37)",
      "popup_border": "rgba(34, 25, 77, 0)",
      "toolbar_bottom_separator": "rgb(145, 168, 208)",
      "toolbar_field_border_focus": "rgba(34, 25, 77, 0)",
      "toolbar_top_separator": "rgba(210, 26, 57, 0)",
      "tab_loading": "rgba(52, 79, 134, 0)"
    }
  }
}