.whatsapp-float {
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 999;
  background: #25d366;
  width: 62px;
  height: 62px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 6px 15px rgba(0,0,0,.25);
  transition: all .25s ease;
}
.whatsapp-float:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 20px rgba(37, 211, 102, 0.45);
}
.whatsapp-float img {
  width: 34px;
  height: 34px;
  filter: brightness(0) invert(1);
}
@media (max-width: 600px) {
  .whatsapp-float {
    width: 54px;
    height: 54px;
    bottom: 18px;
    right: 18px;
  }
  .whatsapp-float img {
    width: 30px;
    height: 30px;
  }
}