.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;
  }


  @keyframes shake {
    0% { transform: translateY(0); }
    25% { transform: translateY(-15px); }
    50% { transform: translateY(15px); }
    75% { transform: translateY(-15px); }
    100% { transform: translateY(0); }
  }
  
  /* Apply the shake animation to the button when the "shake-button" class is active */
  .shaking {
    animation: shake 0.5s ease-in-out infinite;
  }