#history_box {
    width: 100%;
    background: url(../images/bg9.jpg);
    background-size: 100% auto;
}

.main_txt {
    width: 1200px;
    margin: 0 auto;
    padding-bottom: 60px;
}

.main_txt p {
    text-indent: 2rem;
    color: #666666;
    font-size: 16px;
    line-height: 26px;
    margin-bottom: 10px;
}

.main_txt img {
    width: 100%;
}