<div class="container">
  <p>stretch</p>
  <div class="box row stretch">
    <div class="item">item1</div>
    <div class="item">item2</div>
    <div class="item">item3</div>
    <div class="item">item4</div>
    <div class="item">item5</div>
  </div>
</div>
<div class="container">
  <p>flex-start</p>
  <div class="box row flex-start">
    <div class="item">item1</div>
    <div class="item">item2</div>
    <div class="item">item3</div>
    <div class="item">item4</div>
    <div class="item">item5</div>
  </div>
</div>
<div class="container">
  <p>flex-end</p>
  <div class="box row flex-end">
    <div class="item">item1</div>
    <div class="item">item2</div>
    <div class="item">item3</div>
    <div class="item">item4</div>
    <div class="item">item5</div>
  </div>
</div>
<div class="container">
  <p>center</p>
  <div class="box row center">
    <div class="item">item1</div>
    <div class="item">item2</div>
    <div class="item">item3</div>
    <div class="item">item4</div>
    <div class="item">item5</div>
  </div>
</div>
<div class="container">
  <p>space-between</p>
  <div class="box row space-between">
    <div class="item">item1</div>
    <div class="item">item2</div>
    <div class="item">item3</div>
    <div class="item">item4</div>
    <div class="item">item5</div>
  </div>
</div>
<div class="container">
  <p>space-around</p>
  <div class="box row space-around">
    <div class="item">item1</div>
    <div class="item">item2</div>
    <div class="item">item3</div>
    <div class="item">item4</div>
    <div class="item">item5</div>
  </div>
</div>

.box {
  background-color: #eee;
}

.row {
  height: 200px;
}

.stretch {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  align-items: stretch;
  align-content: stretch;
}

.flex-start {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  align-items: flex-start;
  align-content: flex-start;
}

.flex-end {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  align-items: flex-start;
  align-content: flex-end;
}

.center {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  align-items: flex-start;
  align-content: center;
}

.space-between {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  align-items: flex-start;
  align-content: space-between;
}

.space-around {
  display: flex;
  flex-flow: row wrap;
  justify-content: flex-start;
  align-items: flex-start;
  align-content: space-around;
}

.item {
  width: 120px;
  padding: 12px 0;
  background-color: #d1dde3;
  text-align: center;
}//.item

.container {
  margin-bottom: 48px;
  
  p {
    font-size: 24px;
    font-weight: bold;
  }
}//.container