Unable to add box-shadow

Hello World

Adding a box-shadow to the thumbnail is challenging. please help because I cannot move forward.

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

<style>
h4 {
  text-align: center;
  background-color: rgba(45, 4, 5, 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;
}
</style>
<div class="fullCard" id="thumbnail">
<box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);

<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 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Challenge: Add a box-shadow to a Card-like Element

Link to the challenge:

box shadow is in the CSS language, so you should be declaring inside the <style> tags, or with the style attribute.

for example:

.myClass {
    box-shadow: 0 2px 3px rgba(0,0,0,0.19);
}

box-shadow isn’t an html tag. It’s a style property. It should be in the appropriate part of the style section.