#s2 {
    background-image: url(/images/index_slide/2/4e20fd2a0b3525227b266d7f2bacc13d.jpg);
}
#s3 {
    background-image: url(/images/index_slide/3/746d20b476c2cd9d7a92e14c075cb598.jpg);
}
#s4 {
    background-image: url(/images/index_slide/4/964a84adfd1e456d1f74638a82113570.jpg);
}

@media only screen and (max-width: 768px) {

#s2 {
    background-image: url(/images/index_slide/2/79d63435adccf8fe48fd12a9b33aa9b5.jpg);
}
#s3 {
    background-image: url(/images/index_slide/3/);
}
#s4 {
    background-image: url(/images/index_slide/4/);
}
}
@media only screen and (max-width: 414px) {
#s2 {
    background-image: url(/images/index_slide/2/e6644de9f05c7f2471e0eaacb4bb6c64.jpg);
}
#s3 {
    background-image: url(/images/index_slide/3/);
}
#s4 {
    background-image: url(/images/index_slide/4/);
}
}