body {
    background-image: url('../images/history.png');
    width: 100%;
    height: 2703px;
    margin: 0px;
    padding: 0px;
}

.headcontent {
    width: 100%;

}

.headtop {
    display: flex;
    flex-direction: row;
    height: 110px;
    width: 1700px;
    margin: 0 auto;
}

.headtopleft {
    width: 40%;
    text-align: left;
}

.headtopright {
    width: 60%;
}

.headtopright a {
    text-decoration: none;
    color: white;
}

.headtopleft img {
    margin-top: 34px;
    width: 139px;
    height: 42px;
}

ul {
    display: flex;
    justify-content: center; /* 水平居中 */
    list-style-type: none;
    color: #FFFFFF;
    font-size: 16px;
    margin: 0px;
}

    ul li {
        width: 100px;
        height: 110px;
        line-height: 110px;
    }

.active {
    color: #7070D5;
}

    .active::after {
        position: relative;
        content: '';
        width: 64px;
        height: 2px;
        top: -96px;
       
        background: #7070D5;
        display: inline-block;
    }