div.img_div{
    height: 0;
    padding-bottom: 50%;
    position: relative;
    overflow: hidden;
    max-width: 100%;    
    height: auto;
}

div.img{
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    /* min-height: 15vh; */
    border-radius: 10px 30px 10px 30px;
    background-size: cover;
}

div.img.young_adult1{
    background-image: url('young_adult/cnb_50.png');
}

div.img.young_adult2{
    background-image: url('young_adult/cnb2.11.15.png');
}

div.img.young_adult3{
    background-image: url('young_adult/busan_cnb.png');
}

section#page-title.page-title-parallax{
    background-image: url(/skin/board/young_adult/young_adult/top.png) !important;
}