Some icons are redistributed, unchanged, under the Apache 2.0 License, provided as LICENSE-2.0.txt
* Google https://iconarchive.com/show/noto-emoji-symbols-icons-by-google/73028-warning-icon.html
Some icons are redistributed, unchanged, under the CC BY 3.0 License: https://creativecommons.org/licenses/by/3.0/#
* Tahsin Tahil (https://www.iconfinder.com/icons/381599/error_icon)
Some icons are redistributed, unchanged, under the CC BY-ND 3.0 License: https://creativecommons.org/licenses/by-nd/3.0/
* http://www.icons8.com