abstract：*{margin: 0;padding: 0}body{color: #000;font-family: 'Times New Roman', Times, serif;font-size: 16px;}.clear{clear: both;}.top{width: 100%;height: 100px;margin: 0 auto;overflow: hidden;}a{text
*{margin: 0;padding: 0}
body{color: #000;font-family: 'Times New Roman', Times, serif;font-size: 16px;}
.clear{clear: both;}
.top{width: 100%;height: 100px;margin: 0 auto;overflow: hidden;}
a{text-decoration: none;}
ul,li{list-style: none;}
.menu{width: 905px;height:auto;margin: 0 auto;cursor: pointer;background:pink;}
.menu_ul{width: 100%;text-align: left;position: relative;}
.menu_ul li a{color: #000;}我把这一整节看完了再写