The last two challenges used the flex-direction property set to row.

This property can also create a column by vertically stacking the children of a flex container.

Add the CSS property flex-direction to the #box-container element, and give it a value of column.

<style> #box-container { display: flex; height: 500px; flex-direction: column; } #box-1 { background-color: dodgerblue; width: 50%; height: 50%; } #box-2 { background-color: orangered; width: 50%; height: 50%; } </style> <div id="box-container"> <div id="box-1"></div> <div id="box-2"></div> </div>

FCC---CSS Flexbox: Use the flex-direction Property to Make a Column