.input {
  -webkit-appearance: none;
 /* remove default */
  display: block;
  margin: 10px;
  width: 24px;
  height: 24px;
  border-radius: 12px;
  cursor: pointer;
  vertical-align: middle;
  box-shadow: hsla(0,0%,100%,.15) 0 1px 1px, inset hsla(0,0%,0%,.5) 0 0 0 1px;
  background-color: hsla(0,0%,0%,.2);
  background-image: -webkit-radial-gradient( hsla(200,100%,90%,1) 0%, hsla(200,100%,70%,1) 15%, hsla(200,100%,60%,.3) 28%, hsla(200,100%,30%,0) 70% );
  background-repeat: no-repeat;
  -webkit-transition: background-position .15s cubic-bezier(.8, 0, 1, 1),
    -webkit-transform .25s cubic-bezier(.8, 0, 1, 1);
  outline: none;
}

.input:checked {
  -webkit-transition: background-position .2s .15s cubic-bezier(0, 0, .2, 1),
    -webkit-transform .25s cubic-bezier(0, 0, .2, 1);
}

.input:active {
  -webkit-transform: scale(1.5);
  -webkit-transition: -webkit-transform .1s cubic-bezier(0, 0, .2, 1);
}



/* The up/down direction logic */

.input,
.input:active {
  background-position: 0 24px;
}

.input:checked {
  background-position: 0 0;
}

.input:checked ~ .input,
.input:checked ~ .input:active {
  background-position: 0 -24px;
}