.button {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #e8e8e8;
  background-color: #212121;
  width: 70px;
  height: 70px;
  font-size: 24px;
  text-transform: uppercase;
  border: 2px solid #212121;
  border-radius: 50%;
  transition: all 0.6s cubic-bezier(0.23, 1, 0.320, 1);
  box-shadow: 5px 5px 2px rgba(0, 0, 0, 0.15),
    2px 2px 2px rgba(0, 0, 0, 0.1),
    -3px -3px 2px rgba(255, 255, 255, 0.05),
    -2px -2px 1px rgba(255, 255, 255, 0.05);
  overflow: hidden;
  cursor: pointer;
}

.button .span {
  position: relative;
  z-index: 2;
  transition: all 0.6s cubic-bezier(0.23, 1, 0.320, 1);
}

.button::before {
  content: "";
  position: absolute;
  background-color: #e8e8e8;
  width: 150%;
  height: 150%;
  left: 0%;
  bottom: 0%;
  transform: translate(-100%, 100%) rotate(45deg);
  border-radius: 15px;
}

.button:hover::before {
  animation: shakeBack 0.6s forwards 0.6s;
}

.button:hover .span {
  scale: 1.2;
}

.button:hover {
  box-shadow: none;
}

.button:active {
  scale: 0.95;
}

@keyframes shakeBack {
  0% {
    transform: translate(-100%, 100%) rotate(45deg);
  }

  50% {
    transform: translate(15%, -15%) rotate(45deg);
  }

  100% {
    transform: translate(-10%, 10%) rotate(45deg);
  }
}