.row {
  display:flex;
  flex-wrap:wrap;
  padding: 0 4px;

}
.column {
  max-width: 25%;
  padding: 0 4px;
}
.column img {
  margin-top: auto;
  vertical-align: middle;
  width: 100%;
}
@media screen and (max-width: 800px) {
  .column {
    flex: 50%;
    max-width: 50%;
  }
}
@media screen and (max-width: 600px) {
  .column {
    flex: 100%;
    max-width: 100%;
  }
}