.preview-img-box{
  margin-top:70px;
  max-width:700px;
  margin-left:auto;
  margin-right:auto;
}
.preview-img-box:first-of-type{
  margin-top:0;
}
.preview-box{
  margin-top:90px;
}

@media (max-width:1400px){
  .preview-img-box{
    max-width:92vw;
  }
}
@media (max-width:767px){
  .preview-box{
    margin-top:9vw;
  }
  .preview-img-box{
    margin-top:7vw;
  }
}