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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<style>
.container {
display: grid;
grid-gap: 5px;
grid-template: auto / 1fr 3fr 1fr;
background: lightyellow;
}
.subgrid {
display: grid;
grid: subgrid / subgrid;
}
header, aside, section, footer {
background: lightblue;
font-family: sans-serif;
font-size: 3em;
}
header, footer {
grid-column: span 3;
}
main {
grid-column: span 3;
}
.aside1 {
grid-column: 1;
}
.aside2 {
grid-column: 3;
}
section {
grid-column: 2;
}
</style>
</head>
<body>
<div class="container">
<header class="subgrid">Header</header>
<main class="subgrid">
<aside class="aside1 subgrid">aside</aside>
<section>section</section>
<aside class="aside2 subgrid">aside2</aside>
</main>
<footer>footer</footer>
</div>
</body>
</html>