.sbu-wa-fab{
  position: fixed;
  right: 16px;
  bottom: 16px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items:center;
  justify-content:center;
  background: #25D366;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
  z-index: 9999;
}
.sbu-wa-fab:hover{ opacity:.9; }