CodePen Embed - display:flex

<div class="container">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>  
</div>
<div class="container">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>  
</div>
<div class="container">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>  
</div>

.container {
  border :4px solid;
  display:flex
}

.container .item {
  width:10px;
  height:10px;
  background-color : orange;
  font-size:4px
}

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