Please help what to do

HTML-CSS
1

Tell us what’s happening:

Your code so far


<style>
 h4 {
   text-align: center;
   padding:10px;
background-color: rgba(45, 45, 45, 0.1)   

 }
 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>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 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/65.0.3325.181 Chrome/65.0.3325.181 Safari/537.36.

Challenge: Adjust the background-color Property of Text

Link to the challenge:

2

Missing semi-colon at the back of the property-value.