how to use flex direction code example

Example: flex-direction column reverse

<h4>This is a Column-Reverse</h4>
<div id="content">
  <div class="box" style="background-color:red;">A</div>
  <div class="box" style="background-color:lightblue;">B</div>
  <div class="box" style="background-color:yellow;">C</div>
</div>
<h4>This is a Row-Reverse</h4>
<div id="content1">
  <div class="box1" style="background-color:red;">A</div>
  <div class="box1" style="background-color:lightblue;">B</div>
  <div class="box1" style="background-color:yellow;">C</div>
</div>