<h1>Centering with CSS</h1>

<h3>Text-Align Method</h3>
<div class="blue-square-container">
  <div class="blue-square"></div>
</div>

<h3>Margin Auto Method</h3>
<div class="yellow-square"></div>

<h3>Absolute Positioning Method</h3>
<div class="green-square"></div>
h1,
h3 {
  text-align: center;
}

.blue-square-container {
  text-align: center;
}

.blue-square {
  background-color: #0074D9;
  width: 100px;
  height: 100px;
  display: inline-block;
}

.yellow-square {
  background-color: #FFDC00;
  width: 100px;
  height: 100px;
  margin: 0 auto;
}

.green-square {
  background-color: #3D9970;
  width: 100px;
  height: 100px;
  position: absolute;
  left: 50%;
  margin-left: -50px;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.