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HTML

            
              <div class="holy-grail">
  <header class="grail-header">
    <span>Header</ span>
  </header>
  <main class="grail-main">
    <span>Main</ span>
    <h1>Holy Grail !</h1>
    <p class="caption">This demo is also available for tweaking wih the Visual Grid Editor included in the <a href="https://cssgrid.cc/#get-grid-builder"> CSS Grid Builder app</a>.</p>
  </main>
  <nav class="grail-nav">
    <span>Navigation</span>
  </nav>
  <aside class="grail-aside">
    <span>Aside</span>
  </aside>
  <footer class="grail-footer">
    <span>Footer</span>
  </footer>
</div>
!

CSS

            
              .holy-grail {
  height: 800px;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 100px 60px 1fr 100px 80px;
  grid-template-areas: 'header' 'navigation' 'main' 'aside-1' 'footer';
  grid-row-gap: 1px;
  grid-column-gap: 1px;
  font-size: 22px;
  text-align: center;
}

.grail-header {
  grid-area: header;
  background-color: #dcd6fe;
  padding: 20px;
}

.grail-nav {
  grid-area: navigation;
  background-color: #c6c0ff;
  padding: 20px;
}

.grail-main {
  grid-area: main;
  background-color: #f9f6d2;
  padding: 20px;
}

.grail-aside {
  grid-area: aside-1;
  background-color: #d4ffd1;
  padding: 20px;
}

.grail-footer {
  grid-area: footer;
  background-color: #ffd1d1;
  padding: 20px;
}

@media screen and (min-width: 786px) {
.holy-grail {
grid-template-areas: 
'header header header header header' 
'. navigation main aside-1 .' 
'footer footer footer footer footer';
grid-template-columns: 5% minmax(10%, 150px) minmax(70%, 150px) minmax(10%, 150px) 5%; 
grid-template-rows: minmax(100px, auto) 1fr minmax(60px, auto);}
}

@media screen and (min-width: 1400px) {
.holy-grail {
grid-template-areas: 
'header header header header header' 
'. navigation main aside-1 .' 
'footer footer footer footer footer';
grid-template-columns: 1fr minmax(10%, 150px) 1000px minmax(10%, 150px) 1fr; 
grid-template-rows: minmax(100px, auto) 1fr minmax(60px, auto);}
}

.caption {
  font-family: helvetica;
  font-size: 16px;
  margin-top: 12px;
}
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