.bfa87-container{
    width:50%;

    position: relative;
}

.bfg87-listener{
    width: 100%;
    height: 100%;
    background-color: transparent;
    position: absolute;
    z-index: 60;
}

.bfa87-container img{
    width: 100%;
}

.bfa87-container .before-image{
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index:50;
}

.bfa87-container .after-image{
    width: 100%;
}