<section>
  <div class="container">
    <nav>Nav</nav>
    <main>Main</main>
    <aside>Sidebar</aside>
  </div>
</section>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;

  display: flex;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
  font-family: "Exo", Arial, sans-serif;
  background-color: #f7f7f7;

  padding: 20px;
}

section {
  width: 90vw;
  min-height: calc(80vh - 40px);
  margin: 0 auto;
  display: flex;
  justify-content: center;
}

.container {
  border: 1px dashed #f36;
  box-shadow: 0 0 0 6px rgb(0 0 0 / 13%);
  border-radius: 1px;
}

.container > * {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px;
  gap: 5px;
  color: #fff;
  font-size: 1.2rem;
  text-shadow: 1px 1px 0 rgb(0 0 0 / 0.5);
}

header {
  background-color: #f1c2c6;
}

aside {
  background-color: #dac2f1;
}

main {
  background-color: #ccf1c2;
}

footer {
  background-color: #c2e9f1;
}

nav {
  background-color: #09f;
}

.container {
  display: grid;
  gap: 20px;

  grid-template-columns: 200px 520px 200px;
}