<h1>align-items: flex-start</h1>
<div class="flex-container flex-start">
  <div class="flex-item first">item1</div>
  <div class="flex-item second">item2</div>
  <div class="flex-item third">item3</div>
</div>

<h1>align-items: center</h1>
<div class="flex-container center">
  <div class="flex-item first">item1</div>
  <div class="flex-item second">item2</div>
  <div class="flex-item third">item3</div>
</div>


<h1>align-items: flex-end</h1>
<div class="flex-container flex-end">
  <div class="flex-item first">item1</div>
  <div class="flex-item second">item2</div>
  <div class="flex-item third">item3</div>
</div>

<h1>align-items: stretch</h1>
<div class="flex-container stretch">
  <div class="flex-item">item1</div>
  <div class="flex-item">item2</div>
  <div class="flex-item">item3</div>
</div>

.flex-container {
  display: flex;
  margin-bottom: 20px;
  padding: 10px;
  background-color: #ccc;
}

.flex-item {
  margin: 10px;
  padding: 10px;
  background-color: yellow;
}

.first {
  height: 70px;
}

.second {
  height: 50px;
}

.third {
  height: 30px;
}

.flex-start {
  align-items: flex-start;
}

.center {
  align-items: center;
}

.flex-end {
  align-items: flex-end;
}

.stretch {
  align-items: stretch;
  height: 130px;
}

h1 {
  margin-bottom: 0;
  font-size: 16px;
}