*{
      margin: 0;
      padding: 0;
}
img{
    border:0;
}
body{
    background-color: #fff;
    font-size: 12px;
    font-family: "微软雅黑",sans-serif;
    z-index: 0;
}
ul{ list-style: none; }

.left{
    float: left;
}
.right{
    float: right;
}
.clear{
    overflow: hidden;
}
.clear-both{
    clear: both;
}