/**顶部导航**/
.top_nav{ position:fixed; top: 0; height: 36px; line-height: 36px; background-color: #5BB79A;width:100%;font-size: 14px;z-index:1000;box-shadow: 0 1px 3px #ccc;}
.top_nav a{ text-decoration: none;}
.top_nav .top_img{ float: left; width: 38px;}
.top_nav .top_txt{ float: left; font-size: 15px; font-weight: bold;color: #fff;}
.top_nav .home{ float: left; margin: 5px;}
.top_nav .down a{ float: right; margin: 3px; background-color: #fff; border-radius: 5%;padding: 0px 10px; color: #5BB79A; line-height: 30px;text-shadow:none;font-weight: normal}