strange button appeared

It appeared a strange “neutral” button before the footer that I can not delete, any suggestions?
See online www.amicidieliaonlus.org

Hi @mpolo,

I hope you are well today and thank you for your question.

To remove it please use the custom CSS code shared in the following topic.

https://colorlibsupport.com/t/remove-download-this-theme-from-bottom-of-home-page/

Best Regards,
Movin