Flexbox

<h3>Flex Start</h3>
<div class="container flex-start">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>
<h3>Flex End</h3>
<div class="container flex-end">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>
<h3>Center</h3>
<div class="container center">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>
<h3>Baseline</h3>
<div class="container baseline">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>
<h3>Stretch</h3>
<div class="container stretch">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>

.container {
  display: flex;
  padding: 10px;
  background-color: beige;
  min-height: 150px;
}
.container > div {
  background-color: orange;
  padding: 20px;
  margin: 5px;
}
.container > div:nth-child(2) {
  font-size: 2em;
}
.flex-start {
  align-items: flex-start;
}
.flex-end {
  align-items: flex-end;
}
.center {
  align-items: center;
}
.baseline {
  align-items: baseline;
}
.stretch {
  align-items: stretch; /* Default */
}

.container {
  display: flex;
  flex-direction: column;
  padding: 10px;
  background-color: beige;
}
.container > div {
  background-color: orange;
  padding: 20px;
  margin: 5px;
}
.container > div:nth-child(2) {
  font-size: 2em;
}
.flex-start {
  align-items: flex-start;
}
.flex-end {
  align-items: flex-end;
}
.center {
  align-items: center;
}
.baseline {
  align-items: baseline;
}
.stretch {
  align-items: stretch; /* Default */
}