#page { background: #333980 url(../img/kv_pc_sora.jpg) 50% 0 fixed no-repeat; background-size: contain;  }

#page { display: flex; flex-direction: row-reverse; justify-content: center; }
#page_spacer { width: 100%; max-width: 600px;}

@media screen and (max-width: 1200px) {
    #page { display: block;}
    #page_spacer { display: none;}
}