.main {
    color: #222;
    width: 740px;
    margin: auto;
    display: flex;
    flex-direction: column;
    /* align-items: center; */
}

.main_children {
    color: #222;
    width: 740px;
    margin: auto;
    line-height: 30px;
}

.main_children h2 {
    text-align: center;
    margin-top: 30px;
}
.main_children p{
    padding-bottom: 10px;
}
.main_children .ind {
    text-indent: 2rem;
}
.main_children .ind_3 {
    text-indent: 3rem;
}
.main h3 {
    line-height: 60px;
}

.main p {
    line-height: 30px;
}

.top {
    width: 30px;
    height: 30px;
    position: fixed;
    right: calc((100vw - 1200px) / 2);
    bottom: 20%;
    cursor: pointer;
    display: none;
    background-color: #999;
    border-radius: 10px;
}

header {
    background-color: #999 !important;
}

footer {
    background-color: #999 !important;
}

* {
    border: 0;
}

table {
    border-collapse: collapse;
    border: 1px solid #aaa;
}

table td, table th {
    border: 1px solid #aaa;
}