.call-button-m {
  display: none;
}
@media screen and (max-width: 767px)
{
  .call-button-m {
    display: block;
    position:absolute;
    right:70px;
    top: -45px;
    z-index: 12;
  }

  .call-button-m a {
    height: 45px;
  }

  .call-button-m a img {
    margin-top: 5px;
  }
}