.bigtitle {
    text-align: center;
    font-size: 28px;
    color: #333333;
    letter-spacing: 6px;
}
.litletitle {
    text-align: center;
    font-size: 14px;
    color: #797D84;
    letter-spacing: 3px;
    margin-top: 12px;
}
.content {
    box-shadow: 0px -1px 12px 0px rgba(222,228,246,0.4);
    margin-top: 30px;
    padding: 40px 0;
}
.gjianjie {
    margin-bottom: 0;
}