button {
  border: 0;
  border-radius: 50px;
  cursor: pointer;
  height: 25px;
  position: relative;
  width: 50px;
  -webkit-appearance: none;
  -moz-appearance: none;
}

button:hover {
  background-color: lightgray;
}

button:focus,
button:active {
  outline: none;
}

button::-moz-focus-inner {
  border: 0;
}

.pin {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  background-color: white;
  border-radius: 98px;
  height: 19px;
  left: 2px;
  position: absolute;
  top: 3px;
  width: 18px;
  transition: left ease 0.5s;
}

button.on {
  background-color: #404043;
}

button.off {
  background-color: #e0e0e0;
}

button.on .pin {
  left: 30px;
}