.svg {
  position: absolute;
  top: 0;
  right: 0;
}
.arm {
  transform-origin: 130px 106px;
}

.svg:hover .arm {
  animation: wave 560ms ease-in-out;
}

@keyframes wave {
  0% {
    transform: rotate(0deg);
  }

  20% {
    transform: rotate(-25deg);
  }

  40% {
    transform: rotate(10deg);
  }

  60% {
    transform: rotate(-25deg);
  }

  80% {
    transform: rotate(10deg);
  }

  100% {
    transform: rotate(0deg);
  }
}

@media (max-width: 500px) {
  .svg:hover .arm {
    animation: none;
  }

  .svg:hover .arm {
    animation: wave 560ms ease-in-out;
  }
}