.img-row {
    margin-top: 30px;
}

/* Create four equal columns that sits next to each other */
.img-column {
  -ms-flex: 33.3%; /* IE10 */
  flex: 33.3%;
  max-width: 33.3%;
  padding: 0 5px;
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .img-column {
    -ms-flex: 100%;
    flex: 100%;
    max-width: 100%;
  }
}