Create a Horizontal Line Using the hr Element

Summary

The hr tag can be used to create a horizontal line across the width of its containing element.
hr is a self-closing tag, and therefore doesn’t need a separate closing tag.

Final Code

<style>
  h4 {
    text-align: center;
    height: 25px;
  }
  p {
    text-align: justify;
  }
  .links {
    text-align: left;
    color: black;
  }
  .fullCard {
    width: 245px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin: 10px 5px;
    padding: 4px;
  }
  .cardContent {
    padding: 10px;
  }
  .cardText {
    margin-bottom: 30px;
  }
</style>
<div class="fullCard">
  <div class="cardContent">
    <div class="cardText">
      <h4><s>Google</s>Alphabet</h4>
<hr>
      <p><em>...they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
    </div>
    <div class="cardLinks">
      <a href="https://en.wikipedia.org/..." target="_blank" class="links">Larry Page</a><br><br>
      <a href="https://en.wikipedia.org/..." target="_blank" class="links">Sergey Brin</a>
    </div>
  </div>
</div>