body {
   background: linear-gradient(cyan, navy);
   background-attachment: fixed;
   background-size: cover;
   font-family: "Comic Sans MS", monospace;
   font-size: 20px;
 }
 h1, h2, h3 {
   text-align: center;
 }
header, nav, main, footer {
    color: cyan;
    border: cyan 4px solid;
    border-radius: 10px;
    padding: 10px 20px;
    background-color: blue;
}

a {
  color: dodgerblue;
}

.box {
  margin: 80px auto;
  max-width: 800px;
  display: grid;
  grid-gap: 10px;
  grid-template-columns: 300px minmax(0,1fr);
}

a:visited {
  color: cyan
}

header {
  padding: 0px;
  grid-row: 1/2;
  grid-column: 1/3;
  background-color: cyan;
  color: blue;
  border: 5px solid dodgerblue;
}

nav {
  grid-row: 2/4;
  grid-column: 1/2;
  height: max-content;
}

main {
  grid-row: 2/3;
  grid-column: 2/3;
  height: max-content;
}

footer {
  grid-row: 3/4;
  grid-column: 2/3;
  text-align: center;
}