input.switch {
  -moz-appearance: none;
  -webkit-appearance: none;
  -o-appearance: none;
  height: 20px;
  width: 40px;
  border-radius: 10px;
  box-shadow: inset -20px 0px 0px 0px rgba(192, 192, 192, 1);
  background-color: white;
  border: 1px solid rgba(192, 192, 192, 1);
  outline: none;
  -webkit-transition: 0.2s;
  transition: 0.2s;
}

input.switch:checked {
  box-shadow: inset 20px 0px 0px 1px rgba(33, 150, 243, 0.5);
  border: 1px solid rgba(33, 150, 243, 1);
}