These icons css classes are created by Antonio Germani
You can use it for free but the author name and reference must be left untouched 

  Copyright (C) 2018-2022 - Antonio Germani, Massignano (AP)
	  https://www.lacasettabio.it 
	  https://www.programmisitiweb.lacasettabio.it
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	  Questo programma e` free software;   e` lecito redistribuirlo  e/o
	  modificarlo secondo i  termini della Licenza Pubblica Generica GNU
	  come e` pubblicata dalla Free Software Foundation; o la versione 2
	  della licenza o (a propria scelta) una versione successiva.
	
	  Questo programma  e` distribuito nella speranza  che sia utile, ma
	  SENZA   ALCUNA GARANZIA; senza  neppure  la  garanzia implicita di
	  NEGOZIABILITA` o di  APPLICABILITA` PER UN  PARTICOLARE SCOPO.  Si
	  veda la Licenza Pubblica Generica GNU per avere maggiori dettagli.
	
	  Ognuno dovrebbe avere   ricevuto una copia  della Licenza Pubblica
	  Generica GNU insieme a   questo programma; in caso  contrario,  si
	  scriva   alla   Free  Software Foundation,  Inc.,   59
	  Temple Place, Suite 330, Boston, MA 02111-1307 USA Stati Uniti.
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	  # free to use, Author name and references must be left untouched  #
	  --------------------------------------------------------------------------	  

All icons used are free to use and come from uxwing.com. They have been modified and colored by Antonio Germani
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Icons come from uxwing.com , https://uxwing.com/license/
Permitted

    All icons on UXWing are free to download, and use personal, commercial projects.
    Attribution and Credit is NOT required, however, any credit will be much appreciated.
    There is no limit to the number of times you can use.
    You may modify the resources according to your requirements.

Brand icons

    All brand logos /icons are trademarks of their respective owners/entities. This should only be used to represent the company or product to which they refer.

Prohibitions

    Resell, Direct redistribute, Sub-license, Claim credit, or Ownership of any of the icons.
    Don’t use this material for SPAM websites, illegal business, illegal activity, and hate/crime.
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