#container {
  display: inline-block;
  width: 100%;
  line-height: 0;
  -webkit-column-count: 4;
  -webkit-column-gap: 10px;
  -moz-column-count: 4;
  -moz-column-gap: 10px;
  column-count: 4;
  column-gap: 10px;
}

.img {
  margin: 10px;
  width: 100% !important;
  height: auto !important;
}



@media (max-width: 1000px) {
  #container {
    -moz-column-count: 3;
    -webkit-column-count: 3;
    column-count: 3;
  }
}

@media (max-width: 800px) {
  #container {
    -moz-column-count: 2;
    -webkit-column-count: 2;
    column-count: 2;
  }
}

@media (max-width: 400px) {
  #container {
    -moz-column-count: 1;
    -webkit-column-count: 1;
    column-count: 1;
  }
}