.maindesign .insert_container {
    margin: 50px 0;
}
.maindesign .img_items {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 30px;
}
.maindesign .img_item {
    margin-bottom: 30px;
    width: 48%;
}
.maindesign .img_item img {
    width: 100%;
    height: auto;
}

@media screen and (max-width:767px) {
    .maindesign .insert_container {
        margin: 30px 0;
    }
    .maindesign .img_item {
        width: 100%;
    }
    
}