Edit in JSFiddle

/* Demo housekeeping */
body {
  font: normal 16px/1.5 Arial, sans-serif;
}

.demo-controls {
  margin: 0 0 10px;
  text-align: center;
}

/* The meat */
.wrapper {
  display: table;
  margin: 0 auto;
  outline: 1px solid black;
}

.column {
  display: table-cell;
  width: 60px;
  height: 100px;
}

.column:nth-child(6n+1) {
  background: #F2777A;
}

.column:nth-child(6n+2) {
  background: #FC6;
}

.column:nth-child(6n+3) {
  background: #9C9;
}

.column:nth-child(6n+4) {
  background: #6CC;
}

.column:nth-child(6n+5) {
  background: #69C;
}

.column:nth-child(6n+6) {
  background: #C9C;
}