body{
    margin:0;
    padding: 0;
    font-family: "微软雅黑";
    background-color: #868686;
    background:url(2f9dfb591dc24c65a6af3b7d910b8fc4.png) top  center no-repeat;
}
ul,p,li{
    margin:0;
    padding:0;
}
#top{
    width: 100%;
    height:490px;
}
.left{float: left;}
#main{
    width:1150px;
    margin:0 auto;
}
.clearfix:after{
    display: block;
    content: '';
    clear: both;
}
.nav{
    width:100%;
    background: #3498DB;
    height:50px;
    line-height:50px;
}
.nav ul{
    width:1150px;
    margin:0 auto;
}
.nav ul li{
    float: left;
    width:20%;
    text-align: center;
}
.nav ul li a{
    color: #fff;
}
.main_left{
    float: left;
    width:350px;
    border:1px solid #ddd;
    margin:15px 20px 15px 0;
    min-height: 550px;
}
.floor{
    margin:5px 0;
}
.left_title{
    height: 40px;
    line-height: 40px;
    font-size: 18px;
    text-indent: 30px;
    float: left;
    width:100%;
}
.left_inner{
    float: right;
    line-height: 35px;
    width:300px;
    text-align: justify;
}
.left_inner span{
    display: inline-block;
    margin-right:24px;
}
.main_right{
    float: left;
    width:780px;
    border:1px solid #ddd;
    margin:15px 0 15px 0;
    min-height: 618px;
}