#box_7{
display:none;
}
@media(max-width:999px){
  #box_7{
  display:block;
    position:relative;
  background-image:url("/rezerwacje/upload/bgm2.jpg");
    background-size:cover;
    background-position:center;
  width:100%;
    height:600px;
  }
  #box_7 h3{
  position: absolute;
    bottom: 0px;
    left: 50%;
    transform: translateX(-50%);
    color:#fff;
    font-size: 20px;
    filter: drop-shadow(2px 4px 6px black);
  }
  #sliderOpona{
  width:320px !important;
    left:23% !important;
  }
}