ul {
  list-style-type: none;
}

li {
  display: inline-block;
}

input[type="checkbox"][id^="cb"] {
  display: none;
}

label {
  /*border: 1px solid #fff;*/
  /*padding: 10px;*/
  display: block;
  position: relative;
  /*margin: 10px;*/
  cursor: pointer;
}

label:before {
  background-color: white;
  color: white;
  content: " ";
  display: block;
  border-radius: 50%;
  border: 1px solid grey;
  position: absolute;
  top: -5px;
  left: -5px;
  width: 25px;
  height: 25px;
  text-align: center;
  line-height: 28px;
  transition-duration: 0.4s;
  transform: scale(0);
}

label img {
  height: 300px;
  width: 30em;
  transition-duration: 0.2s;
  transform-origin: 50% 50%;
}

:checked + label {
  border-color: #ddd;
}

/*:checked + label:before {
  content: "✓";
  background-color: grey;
  transform: scale(1);
}*/

:checked + label img {
  transform: scale(0.9);
  box-shadow: 0 0 15px #d84315;
  /*border-color: #d84315;*/
  z-index: -1;
}