.button {
  width: 45px;
  height: 45px;
  background-color: #3b5998;
  border: none;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  overflow: hidden;
  box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.185),
 0px 3px 3px rgba(255, 255, 255, 0.178) inset,
 0px -3px 3px rgba(0, 0, 0, 0.281) inset;
  transition: all .3s;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding-bottom: 3px;
}

.button::before {
  background-color: transparent;
  content: "f";
  font-size: 1.6em;
  font-weight: 700;
  color: white;
  z-index: 5;
  transition: all .3s;
  font-family: Whitney, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

.button::after {
  content: "acebook";
  background-color: transparent;
  font-size: 0;
  opacity: 0;
  font-weight: 700;
  color: white;
  z-index: 5;
  transition: all .3s;
  transform: translateX(60px);
  font-family: Whitney, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

.button:hover {
  width: 160px;
  border-radius: 30px;
}

.button:hover::after {
  opacity: 1;
  font-size: 1.6em;
  transform: translateX(0px);
}

.button:hover .shine {
  transform: translate(-70px ,10px);
}