【background】
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.box {
border-style: solid;
border-width: 1px;
display: block;
width: 100px;
height: 100px;
background-color: #0000FF;
-webkit-transition: background-color 2s;
transition: background-color 2s;
}
.box:hover {
background-color: #FFCCCC;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
