a.m-button.m-button--link.m-button--large {
    color: white;
    font-size: 80px;
    line-height: 60px;
}

@media screen and (max-width: 767px){
  a.m-button.m-button--link.m-button--large{
    font-size: 40px;
    line-height: 32px;
  }
  
}