A CodePen by Jelmer.

index.html

<div class="wrapper">
  <div>This can be anything.</div>
  <div>This can be anything.</div>
  <div>This can be anything.</div>
  <div>This can be anything.</div>
</div>

script.js

/*

Justified divs, attempt 1

http://code.jelmerdemaat.nl/

style.css

.wrapper{
  width: 550px;
  text-align: justify;
  margin: 20px auto;
  background: firebrick;
}

.wrapper div{
  background: white;
  display: inline-block;
}









/* Only make things clearer */
body{ margin: 0; font-family: sans-serif; font-size: 12px;}
.wrapper,.wrapper div{ padding: 5px; }