.dby {
    width: 100%;
    float: left;
    height: 36px;
    background: #f7f7f7;
}
.dbnav {
    width: 1200px;
    margin: 0 auto;
    line-height: 36px;
    height: 36px;
}
nav {
   margin-top: 30px;
}
.logss {
    width: 1200px;
    margin: 0 auto;
    background: #FFF;
}
.logo {
    float: left;
    margin: 17px 0;
}
.ydd{ display:none;}