fade color

HTML

<a href="#" id="click">click
<div class="test"></div></a>

CSS

.test {
    height: 100px;
    width: 100px;
    background-color: #fc3;
    -webkit-transition: all 1s ease-in-out;
    -moz-transition: all 1s ease-in-out;
    -o-transition: all 1s ease-in-out;
    transition: all 1s ease-in-out;
  }
.otherColor {
    background-color: none;
}

JavaScript

$('#click').on('click', function() {
    $(this).find('div').css('background-color', 'none!important');
});