.article_wrapper {
    width: 100%;
    max-width: 570px;
    margin: 0 auto;
    overflow: hidden;
}

.article_content {
    width: 98%;
    margin: 0 auto;
    color: #333;
}

.article_title {
    padding-top: 37px;
    margin-bottom: 14px;
    font-size: 20px;
    color: #000;
}

.article_detail {
    font-size: 14px;
    line-height: 1.8em;
    font-family: Helvetica;
}

.article_img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
}

.article_1_img,
.article_3_img,
.article_4_img,
.article_6_img,
.article_7_img,
.article_11_img,
.article_12_img,
.box_article_img {
    margin: 36px auto 50px;
}

.article_2_img {
    margin: 46px auto 50px;
}

.article_5_img {
    margin: 36px auto 10px;
}

.preface {
    margin-bottom: 40px;
}

.segmentation {
    margin-bottom: 30px;
}

.first_heading {
    margin: 5px 0;
    font-size: 16px;
    font-weight: bold;
    letter-spacing: 0;
    color: #333;
}

.first_heading_first {
    color: rgb(247, 150, 70);
}

.first_heading_other {
    color: rgb(49, 132, 155);
}

.ext_link,
.ext_link:link,
.ext_link:visited {
    text-decoration: underline;
    font-size: 14px;
    color: rgb(11, 62, 125);
}

.second_part div {
    color: rgb(11, 62, 125);
}

.part_detail {
    margin-top: 8px;
}

.sixteenth_part p {
    text-align: center;
}

.samples {
    text-indent: 2em;
}

.formula {
    text-align: center;
}

.table_title {
    text-align: center;
    font-size: 13px;
    font-weight: bold;
}

.twenty-third_part .source {
    color: rgb(11, 62, 125);
}

.first_table,
.second_table,
.third_table {
    width: 100%;
    border: 1px solid #d6dbe0;
}

.second_table {
    font-size: 13px;
}

.table_th div,
.table_tr div {
    float: left;
}

.table_th {
    background: #ab3904;
    color: #fff;
}

.tr_odd {
    background: #000000;
    color: #fff;
}

.first_table .table_td_one {
    width: 40%;
    box-sizing: border-box;
}

.first_table .table_td_two,
.first_table .table_td_three,
.first_table .table_td_four {
    width: 20%;
    box-sizing: border-box;
}

.table_tr .table_td_two,
.table_tr .table_td_three,
.table_tr .table_td_four,
.table_tr .table_td_five {
    border-left: 1px solid #d6dbe0;
}

.table_td_none {
    background: #fff;
    color: #fff;
}

.second_table .table_td_one {
    width: 8%;
    box-sizing: border-box;
}

.second_table .table_td_two {
    width: 50%;
    box-sizing: border-box;
}

.second_table .table_td_three {
    width: 42%;
    box-sizing: border-box;
}

.third_table .table_td_one {
    width: 20%;
    box-sizing: border-box;
}

.third_table .tr_none .table_td_one {
    width: 60%;
}

.third_table .table_td_two {
    width: 20%;
    box-sizing: border-box;
}

.third_table .table_td_three {
    width: 20%;
    box-sizing: border-box;
}

.third_table .table_td_four {
    width: 8%;
    box-sizing: border-box;
}

.third_table .table_td_five {
    width: 32%;
    box-sizing: border-box;
}