.wrap {
    position: relative;
    z-index: 0;
    height: 100vh;
    width: 100%;
    background-color:cadetblue
}

.banner-show {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

    .banner-show .cell {
        position: relative;
        top: 0;
        left: 0;
        height: 100vh;
        width: 100%;
        overflow: hidden;
        background-repeat: no-repeat;
        background-position: left top;
        background-size: 100% 100%;
        background-attachment: fixed;
    }

.wrapbg {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    background-repeat: no-repeat;
    background-position: left top;
    background-size: 100% 100%;
    /*background-attachment: fixed;*/
}


.bns-01 {
    background-image: url(../images/bk-0.jpeg);
}
.bns-02 {
    background-image: url(../images/bk-1.jpeg);
}
.bns-03 {
    background-image: url(../images/bk-2.jpeg);
}
.bns-04 {
    background-image: url(../images/bk-3.jpeg);
}