<div class="page-container">
  <header class="page-header">Header</header>
  <main class="page-main">
    <nav class="page-nav">Nav</nav>
    <article class="page-article">Article</article>
    <aside class="page-aside">Aside</aside>
  </main>
  <footer class="page-footer">Footer</footer>
</div>
@import url("https://fonts.googleapis.com/css2?family=Jost:wght@300;400;500;600;700&display=swap");

:root {
  --body-bg-color: #fff;
  --body-color: #1b1f31;
  --body-font: "Jost", Helvetica, sans-serif;
  --border-color: #e5e4e9;
  --theme-bg-color: #fff;
  --title-color: #979dc3;
}

*, *::before, *::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  padding: 0;
  margin: 0;
  background-color: var(--body-bg-color);
  color: var(--body-color);
  font-family: var(--body-font);
  font-size: 15px;
  position: relative;
}

.page-container {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-rows: 70px 1.6fr 70px;
  grid-template-columns: 1fr;
  grid-gap: 0 0;
  grid-template-areas: "page-header" "page-main" "page-footer";
}

.page-container header.page-header {
  grid-area: "page-header";
  font-size: 15px;
  font-weight: 700;
  color: var(--title-color);
  text-align: center;
  height: 70px;
  line-height: 70px;
  letter-spacing: .7px;
  text-transform: uppercase;
  background-color: var(--theme-bg-color);
  border-bottom: 1px solid var(--border-color);
}

.page-container main.page-main {
  grid-area: "page-main";
  display: grid;
  grid-template-rows: 1fr;
  grid-template-columns: .375fr 1.6fr .375fr;
  grid-gap: 0 0;
  grid-template-areas: "page-nav page-article page-aside";
}

.page-container main.page-main nav.page-nav {
  grid-area: "page-nav";
  font-size: 15px;
  font-weight: 700;
  color: var(--title-color);
  text-align: center;
  display: grid;
  place-items: center;
  letter-spacing: .7px;
  text-transform: uppercase;
  background-color: var(--theme-bg-color);
  border-right: 1px solid var(--border-color);
}

.page-container main.page-main article.page-article {
  grid-area: "page-article";
  font-size: 15px;
  font-weight: 700;
  color: var(--body-color);
  text-align: center;
  display: grid;
  place-items: center;
  letter-spacing: .7px;
  text-transform: uppercase;
}

.page-container main.page-main aside.page-aside {
  grid-area: "page-aside";
  font-size: 15px;
  font-weight: 700;
  color: var(--title-color);
  text-align: center;
  display: grid;
  place-items: center;
  letter-spacing: .7px;
  text-transform: uppercase;
  background-color: var(--theme-bg-color);
  border-left: 1px solid var(--border-color);
}

.page-container footer.page-footer {
  grid-area: "page-footer";
  font-size: 15px;
  font-weight: 700;
  color: var(--title-color);
  text-align: center;
  height: 70px;
  line-height: 70px;
  letter-spacing: .7px;
  text-transform: uppercase;
  background-color: var(--theme-bg-color);
  border-top: 1px solid var(--border-color);
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.