Examine source code of Chrome Colors (blue)

{
  "manifest_version": 2,
  "version": "3.1",
  "name": "Chrome Colors",
  "theme": {
    "colors": {
      "frame": "#202124",
      "tab_background_text": "#BDC1C6",
      "toolbar": "#323639",
      "icons": "#bebebe",
      "bookmark_text": "#F1F3F4",
      "tab_text": "#F1F3F4",
      "tab_line": "#45a1ff",
      "toolbar_field": "#202124",
      "toolbar_field_text": "#F1F3F4",
      "toolbar_field_separator": "#5f6670",
      "ntp_background": "#2a2a2e",
      "ntp_text": "#F1F3F4",
      "popup": "#2a2a2e",
      "popup_text": "#F1F3F4",
      "popup_highlight": "#474b4e",
      "popup_highlight_text": "#F1F3F4",
      "sidebar": "#2a2a2e",
      "sidebar_text": "#F1F3F4",
      "sidebar_highlight": "#474b4e",
      "sidebar_highlight_text": "#ffffff",
      "sidebar_border": "#202023",
      "button_background_hover": "#424649",
      "button_background_active": "#4d5153",
      "icons_attention": "#45a1ff"
    }
  }
}