Responsive version needs zoom out

Hi guys, my website is working fine on the computer screen however, in the mobile version there is this margin that makes the whatsapp icon (on the bottom right side of the website) disappear. I can only see if I zoom out, and then I realize there is this large right margin hidden, that only show in the reponsive version.
Could anyone please help?
Thank you!

The page I need help with: [log in to see the link]