Edit in JSFiddle

<ul class="flex-container row">
  <li class="flex-item one">1</li>
  <li class="flex-item two ">2</li>
  <li class="flex-item three">3</li>
  <li class="flex-item four">4</li>
  <li class="flex-item five">5</li>
</ul>

.flex-container {
  padding: 0;
  margin: 0;
  list-style: none;
  
  -ms-box-orient: horizontal;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
}
.row           { 
  -webkit-flex-direction: row; 
  flex-direction: row;
  flex-wrap: normal;
}

.flex-item {
  background: tomato;
  padding: 5px;
  width: 50px;
  height: 50px;
  margin: 5px;
  
  line-height: 50px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
}
.three {
	order: -1;
	background: gold
}
.five {
	order: -2;
	background: #594255;
}