.row {
  display: flex;
  flex-wrap: wrap;
  padding: 0 2px;
}

/* Create four equal columns that sits next to each other */
.column {
  flex: 20%;
  max-width: 20%;
  padding: 0 2px;
}

.column img {
  margin-top: 2px;
  vertical-align: middle;
  width: 100%;
}

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 800px) {
  .column {
    flex: 50%;
    max-width: 50%;
  }
}

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

.zoom {
  transition: transform .2s;
  width: 100%;
  margin: 0 auto;
}
.zoom:hover {
  -ms-transform: scale(1.7); /* IE 9 */
  -webkit-transform: scale(1.7); /* Safari 3-8 */
  transform: scale(1.7); 
}