使用Radio Button和JS进行CSS转换

Question

使用我的jQuery代码，我能够从.item获取属性，但我的css转换不起作用。您可以通过将.item替换为.item-tile来查看预期的转换。

如何让我的CSS过渡到我的jQuery代码？

$(".item-wrap").on("click", ".item", function() {
  var itemColor = $(this)
    .find(".icon")
    .css("background-color");
  $(".category-color").css("background-color", itemColor);
  return false;
});

.item-wrap {
  display: flex;
}

.icon {
  margin: 0px 5px 0px 5px;
  position: relative;
  height: 35px;
  width: 35px;
  border-radius: 50%;
}

.item-wrap .item {
  position: relative;
}

.item-wrap .item .radio-button {
  opacity: 0;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  left: 0;
  height: 100%;
  width: 100%;
  margin: 0;
  z-index: 999;
  cursor: pointer;
}

.item-wrap .item .item-tile {
  -webkit-transition: -webkit-transform 300ms ease;
  transition: -webkit-transform 300ms ease;
  -o-transition: transform 300ms ease;
  transition: transform 300ms ease;
  transition: transform 300ms ease, -webkit-transform 300ms ease;
}

.item-wrap .item .radio-button:checked+.item-tile {
  border: 2px solid #079ad9;
  -webkit-transform: scale(1.1, 1.1);
  -ms-transform: scale(1.1, 1.1);
  transform: scale(1.1, 1.1);
}

.category-color {
  height: 50px;
  width: 50px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
  <div class="item-wrap">
    <div class="item">
      <input id="clothing" class="radio-button" type="radio" name="radio" />
      <div class="item-tile">
        <div class="icon" style="background-color:blue;">
        </div>
      </div>
    </div>
    <div class="item">
      <input id="elephant" class="radio-button" type="radio" name="radio" />
      <div class="item-tile">
        <div class="icon" style="background-color:red;">
        </div>
      </div>
      <div class="item">
        <input id="fish" class="radio-button" type="radio" name="radio" />
        <div class="item-tile">
          <div class="icon" style="background-color:green;">
          </div>
        </div>
      </div>
    </div>
  </div>
  <div class="copy-container">
    <div class="category-color">
    </div>
  </div>