​x
 
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<!doctype html>
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<title>Example</title>
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<style>
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body {
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  display: grid;
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  grid-template-areas:
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    "header header header"
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    "nav article ads"
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    "footer footer footer";
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  grid-template-rows: 100px 1fr 70px;  
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  grid-auto-columns: 20% 1fr 15%;
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  grid-gap: 10px;
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  height: 100vh;
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  margin: 0;
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  animation: myAnimation 1s ease 1s 5 alternate forwards;
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  }
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header, footer, article, nav, div {
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  padding: 20px;
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  background: gold;
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}
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#pageHeader {
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  grid-area: header;
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}
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#pageFooter {
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  grid-area: footer;
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}
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#mainArticle {
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  grid-area: article;      
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  }
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#mainNav {
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  grid-area: nav;
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  }
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#siteAds {
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  grid-area: ads;
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  }
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​
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@keyframes myAnimation {
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  100% {
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  grid-template-areas:
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    "header article ads"
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    "nav article ads"
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    "footer footer ads";
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  }
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}  
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</style>
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<body>
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  <header id="pageHeader">Header</header>
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  <article id="mainArticle">Article</article>
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  <nav id="mainNav">Nav</nav>
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  <div id="siteAds">Ads</div>
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  <footer id="pageFooter">Footer</footer>
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</body>