Mobile Footer Button Not Centered

Site URL: https://raconte.boutique/

Hi folks! 

For whatever reason, the button in my footer is not correctly aligning to the center on mobile devices. Any help or code would be appreciated!

For reference, here's my mobile-specific code:

//Mobile Adjustments//
@media screen and (max-width: 640px) {
  .Footer {
     h1, h2, h3, p, a {
     text-align: center !important;
  }}}

@media screen and (max-width: 640px) { 
 h1, h2, h3, p, .sqs-block-button * { 
   text-align: center !important;
  }}

Thanks!

I see it is centered here. Can you explain clearly?