body{
    padding-top: 86px;
}
.head{
    height: 86px;
    position: fixed;
    background-color: #fff;
    left: 0;
    right: 0;
    top: 0;
    margin-left: auto;
    margin-right: auto;
    z-index: 9999;
}
.logo{
    position: absolute;
    top: 20px;
    left: 40px;
}

.nav{
    position: absolute;
    right: 0;
    width: 640px;
    top: 32px;
    font-size: 14px;
    color: #666666;
}
.nav>span{
    float: left;
    width: 20%;
    cursor: default ;
}
.give{
    position: absolute;
    font-size: 0;
    height: 0;
}