<h1>justify-content: flex-start;</h1>
<section class="container flex-start">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: flex-end;</h1>
<section class="container flex-end">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: center;</h1>
<section class="container center">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: space-between;</h1>
<section class="container space-between">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: space-around;</h1>
<section class="container space-around">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: space-around; // itens com flex: 1;</h1>
<section class="container space-around">
  <div class="item flex">1</div>
  <div class="item flex">Teste 2</div>
  <div class="item flex">3</div>
  <div class="item flex">4</div>
</section>

<h1>justify-content: flex-start; // column</h1>
<section class="container flex-start column">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: flex-end; // column</h1>
<section class="container flex-end column">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: center; // column</h1>
<section class="container center column">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: space-between; // column</h1>
<section class="container space-between column">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: space-around; // column</h1>
<section class="container space-around column">
  <div class="item">1</div>
  <div class="item">Teste 2</div>
  <div class="item">3</div>
  <div class="item">4</div>
</section>

<h1>justify-content: space-around; // column // itens com flex: 1;</h1>
<section class="container space-around column">
  <div class="item flex">1</div>
  <div class="item flex">Teste 2</div>
  <div class="item flex">3</div>
  <div class="item flex">4</div>
</section>
.flex-start {
  justify-content: flex-start;
}

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

.center {
  justify-content: center;
}

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

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

/* Flex Container */
.container {
  max-width: 420px;
  margin: 0 auto;
  display: flex;
  border: 1px solid #ccc;
}

.column {
  min-height: 200px;
  flex-direction: column;
}

/* Flex Item */
.item {
  margin: 5px;
  padding: 0 10px;
  background: tomato;
  text-align: center;
  font-size: 1.5em;
}

/* Indica que o conteúdo deve se expandir */
.flex {
  flex: 1;
}

h1 {
  text-align: center;
  margin: 20px 0 0 0;
  font-size: 1.25em;
  font-weight: normal;
}

body {
  font-family: monospace;
  color: #333;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.