how to add a break line in flex boxes css code example

Example: break to a new line flexbox

<div class="container">
  <div class="item"></div>
  <div class="break"></div> <!-- break -->
  <div class="item"></div>
</div>

<style>
  /* Inserting this collapsed row between two flex items will make 
     the flex item that comes after it break to a new row */
  .break {
	flex-basis: 100%;
	height: 0;
  }
</style>