.main{
    background: #f4f4f4;
    /* height: 900px; */
    overflow: hidden;
}
.main_content{
    padding-top: 50px;
    margin-bottom: 50px;
}
p{
    text-indent: 2em;
    line-height: 25px;
    font-size: 12px;
    margin-bottom: 15px;
}