Add a box-shadow to a Card-like Element - need your helpQ!

This is my code so far:

Blockquote 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;

}

#thumbnail {

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

0 6px 6px rgba (0,0,0,0.23);

}

.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>

I cannot find the mistake…

There shouldn’t be any space after rgba (in the #thumbnail styles)

Problem solved, thank you @kevcomedia