.banner {
    background-image: url(../img/case/banner.jpg);
}

.main {
    margin-bottom: 180px;
}

.item {
    width: 100%;
    display: flex;
    flex-direction: column;
    padding-top: 100px;
}

.item .item_top {
    width: 100%;
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

.item .item_top>img {
    width: 100%;
}

.item .item_top .item_top_left {
    width: 52%;
}

.item .item_top .item_top_left .txt1 {
    font-size: 26px;
    line-height: 1;
}

.item .item_top .item_top_left .txt2 {
    font-size: 40px;
    line-height: 53px;
    margin: 20px 0;
}

.item .item_top .item_top_left .txt3 {
    line-height: 1.8;
}

.item_top_right {
    width: 274px;
}

.item_top_right .txt4 {
    padding-top: 30px;
    font-size: 50px;
    height: 110px;
}

.item_top_right .txt4 span {
    font-size: 16px;
}

.item_top_right .txt5 {
    font-size: 13px;
    line-height: 1.8;
}