.zhr_kv{
background-image:url(../images/kv.jpg);
background-size: cover;
width: 100%;
height: 0;
padding-top:32.5%;  
margin: 0 0 40px;
}

/*スマホ用*/
@media (max-width: 767px) {
.zhr_kv{
background-image:url(../images/kvSp.jpg);
padding-top:75%;
}
}

/* スマホ横向き用 */

@media (orientation: landscape) and (max-width: 767px) {
.zhr_kv{
background-image:url(../images/kv.jpg);
width: 100%;
padding-top:32.5%;
}
}