body {
    background-image: ;
}
.cont_right, .cont_middle {
    display: none;
}
.tree_p, .tree li {
    border-bottom: 1px solid #919191;
}
.history_title {
    background-image: ;
    background-repeat: no-repeat;
    height: 150px;
    margin-top: 92px;
}
.history_ul {
    margin-top: 28px;
}
.history_img {
    overflow: hidden;
    position: absolute;
    right: -750px;
    top: 0;
    width: 100%;
}
.history_cont {
    height: 505px;
    margin-bottom: 90px;
    overflow: hidden;
    position: relative;
    width: 750px;
}
.history_ul li {
    color: white;
    cursor: pointer;
    float: left;
    font-size: 16px;
    height: 25px;
    line-height: 25px;
    margin-bottom: 30px;
    margin-right: 10px;
    font-weight:bold;
    text-align: center;
    width: 140px;
}
.red {
    background-color: #e62129;
}
.green {
    background-color: #aec752;
}
.olive {
    background-color: #d1ae77;
}
.blue {
    background-color: #47bbed;
}
.orange {
    background-color: #f08519;
}
.history_ul .history_hover {
   font-size:18px;
}
.history_h1 {
    font-size: 26px;
    font-weight: normal;
    line-height: 40px;
    margin-top: 20px;
}
.history_h2 {
    font-size: 18px;
    font-weight: normal;
    line-height: 30px;
}