*{
    margin: 0;
    padding: 0%;
}
.container{
   width: 100%;
   height: 100vh;
   display: flex;
   align-items: center;
   justify-content: center;
   background: #f3fbff; 
}
.imb-box{
    width: 60%;
    margin: auto;
    line-height: 0;
    background-image: url(background_change_img/background_change_img/background.png);
    overflow: hidden; 
    position: relative;
}
.img-wrap{
    width: 20px;
    position: absolute;
    left: 0;
    top: 0;
    overflow: hidden;
}
span{
    width: 1px;
    height: 100%;
    cursor: ew-resize;
    background: #fff;
    position: absolute;
    left: 20px;
    top: 0;
}
.arrow{
    width: 40px;
    position: absolute;
    top: 50%;
    margin-left: -20px;
    margin-top: -20px;
}