.docu
{
    font-family: 微软雅黑, 宋体, Arial, Helvetica, sans-serif;
    font-size: 16px;
}

.docu h2{font-size: 24px; margin: 12px auto; text-align: center; font-weight: 500;}
.docu h3{font-size: 18px; margin: 12px auto; text-align: center; font-weight: 600;}
.docu p{margin: 10px auto; font-size: 16px;}
.docu img{height: auto; margin-bottom: 6px;}