Je me suis coince dans la partie box-shadow aidez moi svp

1 
<style>

  h4 {

    text-align: center;

    background-color: rgba(45, 45, 45, 0.1);

    padding: 10px;

    font-size: 27px;

  }

  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;

  }

  #thumbnail{

box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);

  }

</style>

<div class="fullCard" id="thumbnail">

  <div class="cardContent">

    <div class="cardText">

      <h4>Alphabet</h4>

      <hr>

      <p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>

    </div>

    <div class="cardLinks">

      <a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>

      <a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>

    </div>

  </div>

</div>
2

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

Pre-formatted-text
Pre-formatted-text1356×380 401 KB

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

3

Sur quoi êtes-vous coincé? Veuillez fournir plus de détails.

4

je ne sais pas ou je vais mettre le box-shadow

5

Je ne sais pas non plus. Est-ce pour un défi spécifique? Nous avons besoin de plus de détails sur exactement ce que vous essayez de faire.