.banner_container{
    position: relative;
    display: inline-block;
    width: max-content;
}

.banner_container>img:not(:first-child){
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;  
    transition: opacity 2000ms;
    -webkit-transition: opacity 2000ms;
    -moz-transition: opacity 2000ms;
}