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;
}

                                    
Alert Bootstrap4 style01

Alert Bootstrap4 style01

Asidebar Bootstrap4 style01

Asidebar Bootstrap4 style01

Asidebar Bootstrap4 style02

Asidebar Bootstrap4 style02

Background div gradient

Background div gradient

Card Bootstrap4 E commerce 01

Card Bootstrap4 E commerce 01

Dropdown right aligned B4

Dropdown right aligned B4

Flat icon Responsive Boxes

Flat icon Responsive Boxes

Input range slider HTML style02

Input range slider HTML style02

Radio button style

Radio button style

Table responsive avec css native

Table responsive avec css native

input file récupérer le nom du fichier

input file récupérer le nom du fichier

login page green one

login page green one