.what_bg {
    padding: 14rem 0;
    background: url('/img/sub/sub_what_sec02_bg.jpg') no-repeat center center /cover;
}

.prgm_sec{
    background: url('/img/sub/prgm_sec_bg.jpg') no-repeat center center /cover;
}

.con0501 .sec04 {
    padding: 14rem 0;
    background: url('/img/sub/m51_sec04_bg.jpg') no-repeat center center /cover;
}
.con0502 .sec04 {
    padding: 14rem 0;
    background: url('/img/sub/m52_sec04_bg.jpg') no-repeat center center /cover;
}

.con0503 .sec03 {
    padding: 14rem 0;
    background: url('/img/sub/m53_sec03_bg.jpg') no-repeat center center /cover;
}

.con0503 .sec05 {
    padding: 8.7rem 0;
    background: url('/img/sub/m53_sec05_bg.jpg') no-repeat center center /cover;
}

.con0603 .sec05 {
    padding: 8.7rem 0;
    background: url('/img/sub/m63_sec05_bg.jpg') no-repeat center center /cover;
}