#cwb-fab {
  position: fixed;
  z-index: 99999;
  bottom: 18px;
}
#cwb-fab.cwb-right { right: 18px; }
#cwb-fab.cwb-left { left: 18px; }

#cwb-fab a {
  display: inline-block;
  padding: 12px 16px;
  border-radius: 999px;
  background: #25D366;
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0,0,0,.15);
}
#cwb-fab a:focus,
#cwb-fab a:hover { opacity: .9; }