--description--

The flex-basis property specifies the initial size of the item before CSS makes adjustments with flex-shrink or flex-grow.

The units used by the flex-basis property are the same as other size properties (px, em, %, etc.). The value auto sizes items based on the content.

--instructions--

Set the initial size of the boxes using flex-basis. Add the CSS property flex-basis to both #box-1 and #box-2. Give #box-1 a value of 10em and #box-2 a value of 20em.

--hints--

The #box-1 element should have the flex-basis property.

assert($('#box-1').css('flex-basis') != 'auto');

The #box-1 element should have a flex-basis value of 10em.

assert(code.match(/#box-1\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?10em;/g));

The #box-2 element should have the flex-basis property.

assert($('#box-2').css('flex-basis') != 'auto');

The #box-2 element should have a flex-basis value of 20em.

assert(code.match(/#box-2\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?20em;/g));

--seed--

--seed-contents--

<style>
  #box-container {
    display: flex;
    height: 500px;
  }

  #box-1 {
    background-color: dodgerblue;
    height: 200px;

  }

  #box-2 {
    background-color: orangered;
    height: 200px;

  }
</style>

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

--solutions--

<style>
  #box-container {
    display: flex;
    height: 500px;
  }

  #box-1 {
    background-color: dodgerblue;
    height: 200px;
    flex-basis: 10em;
  }

  #box-2 {
    background-color: orangered;
    height: 200px;
    flex-basis: 20em;
  }
</style>

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