Use the flex-shrink Property to Shrink Items

Summary

• The flex-shrink property is used ot shrink a flex item if a flex container is smaller than the combined widths of all the flex items.
• The flex-shrink property takes numbers.
  • If one item has a flex-shrink value of 1 and the other has a flex-shrink value of 3, the one with the value of 3 will shrink three times as much as the other.

Final Code

<style>
  #box-container {
    display: flex;
    height: 500px;
  }
  #box-1 {
    background-color: dodgerblue;
    width: 100%;
    height: 200px;
    flex-shrink: 1;
  }

  #box-2 {
    background-color: orangered;
    width: 100%;
    height: 200px;
    flex-shrink: 2;
  }
</style>

<div id="box-container">
  <div id="box-1"></div>
  <div id="box-2"></div>
</div>