/* CSS Document */
body {
   display: grid; 
   grid-template-columns: auto; 100px
   grid-template-rows: 150px auto 25px;
   }
header{
 grid-column: 1 / 3;
 grid-row: 1 / 2;
   }
nav {
 grid-column: 2 / 3;
 grid-row: 2 / 4;
   }
section {
 grid-column: 1 / 2;
 grid-row: 2 / 3;
   }
footer {
grid-column: 1 / 2;
grid-row: 3 / 4;
}