html,

body {

    height: 100%;

}

.page {

    position: absolute;

    width: 100%;

    height: 100%;

}

#page>.bg {

    position: absolute;

    z-index: -1;

    width: 100%;

    height: 100%;

}

#page1>.bg {

    background: url("../images/p1_bg.jpg") no-repeat center center;

    background-size: 100%;

}

#page2>.bg {

    background: url("../images/p2_bg.jpg")no-repeat center center;

    background-size: 100%;

}

#page3>.bg {

    background: url("../images/p3_bg.jpg")no-repeat center center;

    background-size: 100%;

}