<div class="main">
  <div class="section">
    <p class="caption"> stretch (default) </p>
    <div class="box stretch">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
  <div class="section">
    <p class="caption"> flex-start </p>
    <div class="box flex-start">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
  <div class="section">
    <p class="caption"> flex-end </p>
    <div class="box flex-end">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
  <div class="section">
    <p class="caption"> center </p>
    <div class="box center">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
  <div class="section">
    <p class="caption"> space-between </p>
    <div class="box space-between">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
  <div class="section">
    <p class="caption"> space-around </p>
    <div class="box space-around">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>
  <div class="section">
    <p class="caption"> space-evenly </p>
    <div class="box space-evenly">
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
      <div></div>
    </div>
  </div>

</div>
.main {
  display: flex;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  align-items: flex-end;
}

.section {
  margin: 2px;
}

.box {
  border: 1px solid black;
  background-color: lighten(darkorange, 20%);
  display: flex;
  flex-wrap: wrap;
  height: 200px;

  div {
    background-color: orange;
    border: 1px solid black;
    min-width: 12px;
    min-height: 12px;
    margin: 2px;
  }
}

.caption {
  text-align: center;
}

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

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

.center {
  align-content: center;
}

.space-around {
  align-content: space-around;
}

.space-between {
  align-content: space-between;
}

.space-evenly {
  align-content: space-evenly;
}

.stretch {
  align-content: stretch;
}
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