div.gridcontainer {
  display: grid;
  grid-template-columns: 15rem auto;
  row-gap: 1rem;
  column-gap: 1rem;
  grid-template-areas: 
  "pageheader pageheader"
  "navigation maincontent"
  "pagefooter pagefooter"
}
header {
   grid-area: pageheader;
}
footer {
  grid-area: pagefooter;
}
nav {
  grid-area: navigation;
}
main {
  grid-area: maincontent;
}




header {
  background-color: lightblue;
}
nav {
  background-color: brown;;
}
main {
  background-color: linen;
}
footer {
  background-color: lightgray;
}
body {
  font-family: helvetica, sans-serif;
  background-color: yellow;
}
nav ul { list-style: none; padding: 0; margin: 0;}
nav ul li { padding: 0; margin: 0;}
nav a { display: block; font-size: 1.2rem; font-weight: bold; }
nav a:link,
nav a:visited {
  color: white;
  text-decoration: none;
  padding: 0.5em;
  border-bottom: 1px solid white;
}
nav li:first-child a:link {
  border-top: 1px solid white;
}
nav a:hover,
nav a:active {
  color: brown;
  background-color: white;
  
}
* { box-sizing: border-box;}
body { line-height: 1.5;}