how to draw a hr line in css centered alibned code example

Example 1: CSS technique for a horizontal line with icons in the middle

<h1>Heading</h1>
<h1>This is a longer heading</h1>

h1 {
  overflow: hidden;
  text-align: center;
}

h1:before,
h1:after {
  background-color: #000;
  content: "";
  display: inline-block;
  height: 1px;
  position: relative;
  vertical-align: middle;
  width: 50%;
}

h1:before {
  right: 0.5em;
  margin-left: -50%;
}

h1:after {
  left: 0.5em;
  margin-right: -50%;
}

Example 2: center element in div

/* html */
<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>

/* css */
h1,
h3 {
  text-align: center;
}

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

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