.columns {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  width: 640px;
  column-gap: 8px;
}
.column {
  width: 150px;
  height: 250px;
  border: 4px solid black;
  border-radius: 8px;
  background-color: #C0C0C0;
  text-align: center;
  vertical-align: middle;
  line-height: 250px;
}