Css Page grid layout

<!DOCTYPE html>
<html>
<head>
    <title>PLANET ANIMÉE STYLE01 | par MEZGANI SAID</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="keyword" content="PLANET ANIMÉE STYLE01">
    <meta name="author" content="Mezgani said">
    <meta name="copyright" content="NGLESSON">
	<link rel="stylesheet" href="style.css" type="text/css">   
</head>
<body>
  <header>header</header>
  <nav>nav</nav>
  <section>section</section>
  <aside>aside</aside>
  <footer>footer</footer>
</body>
</html>

@import url("https://fonts.googleapis.com/css2?family=Exo&display=swap");
* {
	 margin: 0;
	 padding: 0;
}

body { 
	font-family: "Exo", sans-serif;
	display: grid;
	grid-template-areas: 
    "header header header"
    "nav section aside"
    "footer footer footer";
	grid-template-rows: 80px 1fr 50px;
	grid-template-columns: 15% 1fr 18%;
	grid-gap: 5px;
  height: 100vh;
  margin: 10px;  
}

header {
	background: #707070;
	grid-area: header;
}

nav {
	background: #C9BFBF;
	grid-area: nav; 
}

section {
	background: #ABABAB;
	grid-area: section;    
}

aside {
	background: #C9C9C9;
	grid-area: aside; 
}

footer {
	background: #707070;
	grid-area: footer;
}

header, nav, section, aside, footer {
	padding: 5px;
}

                                    
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