what is the flex box

Flexbox properties:
1.flex-direction
2.flex-wrap
3.flex-flow
4.justify-content
5.align-items
6.align-content

<div class="flex-container">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>
<style>
  .flex-container {
  display: flex; // default: flow
  flex-direction: column; // elements in a column
}
</style>
 

flexbox definition