.nav_item {
    float: left;
    z-index: 1;
    padding-right: 24px;
}

.nav_item:last-child {
    padding-right: 0;
}

.nav_link {
    line-height: 55px;
    font-size: 16px;
    overflow: hidden;
    height: 52px;
    text-align: center;
    white-space: nowrap;
    display: block;
}

.nav_item_sub {
    position: absolute;
    width: 100vw;
    background: #ffffff;
    left: 0;
    display: none;
    min-height: 400px;
}
.nav_item_sub_container {
    margin: 0 auto;
    max-width: 1200px;
    padding: 24px;
}
.nav_item:hover .nav_item_sub {
    display: block;
}

.nav_item_sub_column_title {
    font-size: 18px;
    font-weight: 500;
}
.nav_item_sub_column_content {
    line-height: 24px;
}