 class="playable-css">
.box {
  width: 500px;
  display: flex;
  flex-wrap: wrap;
}
.box>* {
  flex: 0 0 33.3333%;
}</textarea
    >
    <textarea id="code" class="playable-html">
<div class="box">
  <div>One</div>
  <div>Two</div>
  <div>Three</div>
  <div>Four</div>
  <div>Five</div>
  <div>Six</div>
  <div>Seven</div>
  <div>Eight</div>
  <div>Nine</div>
  <div>Ten</div>
</div></textarea
    >
    <div class="playable-buttons">
      <input id="reset" type="button" value="Reset" />
    </div>
  </body>
 