Divide the Grid Into an Area Template help me i'm stuck here

Tell us what’s happening:

Your code so far

  .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;
    /* change code below this line */
    grid-template-areas:                                              " content content"
      "footer footer footer";
    /* change code above this line */
<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>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36.

Link to the challenge:

“header header header”
“advert content content”
“footer footer footer”;

The above is the structure, each word header, advert, content and footer refer cells and content between " " refers to a row
So, there are 3 cells in each row
All you have to do is make the cell called as advert into an empty cell

And this is the instruction

In addition to custom labels, you can use a period (.) to designate an empty cell in the grid.