.slider {
    max-width: 400px;
    margin: 0 auto;
  }
  
  .slider__input {
    width: 100%;
  }
  
  .slider__image {
    display: block;
    margin: 20px auto;
    max-width: 100%;
  }



  #box {
    width: 50px;
    height: 50px;
    background-color: red;
    position: absolute;
  }