.slider{max-width:400px;margin:0 auto 300px}.slider__input{width:100%}.slider__image{display:block;margin:20px auto;max-width:100%;transform-origin:top center}.move-area{width:400px;height:300px;border:2px dashed black;position:relative;margin:20px auto}#box{width:50px;height:50px;background:red;position:absolute}