Examine source code of Clean dark and blue theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark and blue theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(37, 37, 37)",
      "toolbar_text": "rgb(237, 237, 237)",
      "frame": "rgb(37, 37, 37)",
      "tab_background_text": "rgb(199, 199, 199)",
      "toolbar_field": "rgb(30, 30, 30)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(33, 33, 33)",
      "popup": "rgb(37, 37, 37)",
      "popup_text": "rgb(249, 249, 249)",
      "button_background_active": "rgb(49, 91, 238)",
      "button_background_hover": "rgb(101, 101, 101)",
      "icons_attention": "rgb(49, 146, 238)",
      "ntp_background": "rgb(37, 37, 37)",
      "popup_border": "rgba(199, 199, 199, 0)",
      "popup_highlight": "rgb(49, 91, 238)",
      "tab_selected": "rgb(86, 86, 86)",
      "toolbar_bottom_separator": "rgb(37, 37, 37)",
      "toolbar_field_border_focus": "rgb(49, 91, 238)",
      "toolbar_field_highlight": "rgb(49, 91, 238)",
      "toolbar_field_separator": "rgba(85, 52, 241, 0)",
      "toolbar_top_separator": "rgba(85, 52, 241, 0)",
      "tab_loading": "rgb(33, 33, 33)"
    }
  }
}