About Divide the Grid Into an Area Template

Anyone can help with this?
I don’t get it at all… why it keeps saying that I did wrong

  **Your code so far**

<style>
.item1{background:LightSkyBlue;}
.item2{background:LightSalmon;}
.item3{background:PaleTurquoise;}
.item4{background:LightPink;}
.item5{background:PaleGreen;}

.container {
  font-size: 40px;
  min-height: 300px;
  width: 100%;
  background: LightGray;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr;
  grid-gap: 10px;
  grid-template-areas:
  /* Only change code below this line */
    "header header header"
    ". content content"
    "footer footer footer";
  /* Only change code above this line */
}
</style>

<div class="container">
<div class="item1">1</div>
<div class="item2">2</div>
<div class="item3">3</div>
<div class="item4">4</div>
<div class="item5">5</div>
</div>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36

Challenge: Divide the Grid Into an Area Template

Link to the challenge:

This is the code prior to you changing anything

/* Only change code below this line */
      "header header header"
      "advert content content"
      "advert footer footer";
    /* Only change code above this line */

You changed two things. Only one change was required to pass the test.