section#contents section#hero .slide img {
    background-size: calc(Min(100vw,1366px)) ;
    background-position: top center;
    background-repeat: no-repeat;
    height: calc(768 * 100vw / 1366);
    max-height: 768px;
    width: 100vw
}

section#contents section#hero .slide img#img0 {
    background-image: url('../img/hero/hero.0.png');
}

section#contents section#hero .slide img#img1 {
    background-image: url('../img/hero/hero.1.png');
}

section#contents section#hero .slide img#img2 {
    background-image: url('../img/hero/hero.2.png');
}