.longphoto{
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 10px;
}
.longphoto img{
  width: 100%;
  object-fit: cover;
  max-height: 100px;
}
.longphoto img:nth-child(2){
  display: none;
}

@media(max-width:700px){
  .longphoto img:nth-child(1){
    display: none;
  }
  .longphoto img:nth-child(2){
    display: inline;
  }
}