<h3>「align-self: auto;」を使用した例</h3>
<div class="flex">
  <div class="item">1番目の要素</div>
  <div class="item flex-auto">2番目の要素</div>
  <div class="item">3番目の要素</div>
</div>
<hr>

<h3>「align-self: stretch;」を使用した例</h3>
<div class="flex">
  <div class="item">1番目の要素</div>
  <div class="item stretch">2番目の要素</div>
  <div class="item">3番目の要素</div>
</div>
<hr>

<h3>「align-self: flex-start;」を使用した例</h3>
<div class="flex">
  <div class="item">1番目の要素</div>
  <div class="item flex-start">2番目の要素</div>
  <div class="item">3番目の要素</div>
</div>

<hr>
<h3>「align-self: flex-end;」を使用した例</h3>
<div class="flex">
  <div class="item">1番目の要素</div>
  <div class="item flex-end">2番目の要素</div>
  <div class="item">3番目の要素</div>
</div>

<hr>
<h3>「align-self: center;」を使用した例</h3>
<div class="flex">
  <div class="item">1番目の要素</div>
  <div class="item center">2番目の要素</div>
  <div class="item">3番目の要素</div>
</div>

<hr>
<h3>「align-self: baseline;を使用した例</h3>
<div class="flex">
  <div class="item">1番目の要素</div>
  <div class="item baseline">2番目の要素</div>
  <div class="item">3番目の要素</div>
</div>
.flex {
  display:flex;
  height:150px;
}

.stretch {
  align-self: stretch;
}
.flex-start {
  align-self: flex-start;
  height: 50px;
}
.flex-end {
  align-self: flex-end;
  height: 50px;
}

.center {
  align-self: center;
  height: 50px;
}

.baseline{
  height: 50px;
}

.flex-auto, .flex-start, .flex-end, .center, .baseline {
  background-color: lightskyblue;
  flex-wrap:wrap;
}


.item {
  background-color: red;
  color:#fff;
  margin: 5px;
  text-align: center;
  padding: 10px;
}

.item:nth-of-type(even) {
  background-color: blue;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.