CSS

grid-template-areas css

#page {
  display: grid;
  width: 100%;
  height: 250px;
  grid-template-areas: "head head"
                       "nav  main"
                       "nav  foot";
  grid-template-rows: 50px 1fr 30px;
  grid-template-columns: 150px 1fr;
}

#page > header {
  grid-area: head;
  background-color: #8ca0ff;
}

#page > nav {
  grid-area: nav;
  background-color: #ffa08c;
}

#page > main {
  grid-area: main;
  background-color: #ffff64;
}

#page > footer {
  grid-area: foot;
  background-color: #8cffa0;
}

grid-template-areas

wrapper {

    display: grid;

    grid-template-columns: repeat(9, 1fr);

    grid-auto-rows: minmax(100px, auto);

    grid-template-areas:

      "hd hd hd hd   hd   hd   hd   hd   hd"

      "sd sd sd main main main main main main"

      "ft ft ft ft   ft   ft   ft   ft   ft";

}

grid template areas

#page {
  display: grid;
  width: 100%;
  height: 250px;
  grid-template-areas: "head head"
                       "nav  main"
                       "nav  foot";
 
}

#page > header {
  grid-area: head;
  background-color: #8ca0ff;
}

#page > nav {
  grid-area: nav;
  background-color: #ffa08c;
}

#page > main {
  grid-area: main;
  background-color: #ffff64;
}

#page > footer {
  grid-area: foot;
  background-color: #8cffa0;
}

grid template areas

/* Keyword value */
grid-template-areas: none;

/* <string> values */
grid-template-areas: "a b";
grid-template-areas: "a b b"
                     "a c d";

/* Global values */
grid-template-areas: inherit;
grid-template-areas: initial;
grid-template-areas: unset;