<div class="flex-container space-between" style="width: 100%; justify-content: space-around;">
  <div class="side dir-col flex-container">
    <h1>Align items with direction = <u><i>row</i></u></h1>
    
    <h2>flex-start</h2>
    <div class="dir-row flex-container flex-start">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>flex-end</h2>
    <div class="dir-row flex-container flex-end">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>center</h2>
    <div class="dir-row flex-container flex-center">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>stretch</h2>
    <div class="dir-row flex-container flex-stretch">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>baseline</h2>
    <div class="dir-row flex-container flex-baseline">
      <div>1</div>
      <div style="padding-top: 20px">2</div>
      <div style="padding-bottom: 30px">3</div>
    </div>
  </div>
  
  <div class="side dir-col flex-container">
    <h1>Align items with direction = <u><i>column</i></u></h1>
    
    <h2>flex-start</h2>
    <div class="dir-col flex-container flex-start">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>flex-end</h2>
    <div class="dir-col flex-container flex-end">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>center</h2>
    <div class="dir-col flex-container flex-center">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>stretch</h2>
    <div class="dir-col flex-container flex-stretch">
      <div>1</div>
      <div>2</div>
      <div>3</div>
    </div>
    
    <h2>baseline (nothing happens)</h2>
    <div class="dir-col flex-container flex-baseline">
      <div>1</div>
      <div style="padding-right: 20px">2</div>
      <div style="padding-left: 30px">3</div>
    </div>
  </div>
</div>

.flex-container {
  display: flex;
  margin-bottom: 15px;
}

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

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

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

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

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

/* General styles */

.dir-row {
  flex-direction: row;
  min-height: 80px;
}

.dir-col {
  flex-direction: column;
}

.side + .side {
  margin-left: 15px;
}

.side .flex-container {
  background-color: lightblue;
}

.side .flex-container div {
  background-color: lightgreen;
  padding: 10px;
  text-align:center;
  border: 2px solid lightblue;
}

h1, h2 {
  margin-top: 0;
}