.switch {
  position: absolute;
  margin-left: -9999px;
  visibility: hidden;
}

.switch + label {
  display: inline-block;
  position: relative;
  cursor: pointer;
  outline: none;
  user-select: none;
}

.switch--shadow + label {
  padding: 2px;
  width: 40px;
  height: 20px;
  background-color: #dddddd;
  border-radius: 20px;
}

.switch--shadow + label:before,
.switch--shadow + label:after {
  display: block;
  position: absolute;
  top: 1px;
  left: 1px;
  bottom: 1px;
  content: '';
}
.switch--shadow + label:before {
  right: 1px;
  background-color: #f1f1f1;
  border-radius: 20px;
  transition: all 0.4s;
}
.switch--shadow + label:after {
  width: 21px;
  background-color: #fff;
  border-radius: 100%;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  transition: all 0.4s;
}

.switch--shadow:checked + label:before {
  background-color: #8ce196;
}
.switch--shadow:checked + label:after {
  transform: translateX(20px);
}