ref - https://css-tricks.com/almanac/properties/t/transition/
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<style>
.testArea {
height: 120px;
float: left;
padding: 10px 10px 0 10px;
background: #ebebeb;
margin-right: 20px;
position: relative;
transition: all .2s;
margin-top: 10px;
}
.testArea:hover {
cursor: pointer;
background: #c4c3c3 !important;
}
</style>
<div class="testArea">
</div>
origin - http://www.pipiscrew.com/?p=5105 css-transition-all