.whatsapp {
  background: #25d366;
  color: #fff;
  font-size: 0;
  transition: transform .2s ease, background .2s ease;
}

.whatsapp svg {
  width: 31px;
  height: 31px;
  display: block;
  fill: none;
  stroke: #fff;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.whatsapp svg path + path {
  fill: #fff;
  stroke: none;
}

.whatsapp:hover {
  background: #1ebe5d;
  transform: translateY(-2px);
}