How to add thumbnail id in this chart

Tell us what’s happening:

Your code so far


<style>
  h4 {
    text-align: center;
    background-color: rgba(45, 45, 45, 0.1);
    padding: 10px;
    font-size: 27px;
  }
  thumbnail id{
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);}
    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" 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>

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:61.0) Gecko/20100101 Firefox/61.0.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/applied-visual-design/add-a-box-shadow-to-a-card-like-element

i m saying about thumbnail id .

css code i have written is passed but one click is about add it in thumbnail id. is not passing the test

You have called the id in wrong way, it’s not like this, if its class it should be .class and id it should be #id

yes i got it ,i did in past , thanks

<style>
  h4 {
    text-align: center;
    background-color: rgba(45, 45, 45, 0.1);
    padding: 10px;
    font-size: 27px;
  }
  thumbnail id{
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);}
    text-align: justify;
  }
  .links {
    text-align: left;
    color: black;
  }

this topic is years old, if you have any questions I suggest you open your own topic