.case_imgs{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 20px 0;
}
.case_imgs .item{
    width: 45%;
    margin-bottom: 80px;
}
.case_imgs .item .img{
    width: 100%;
    height: 300px;
    background: #eee;
}