body {
  display: grid;
  place-items: center;
  background: #c0c0c0;
}

footer {
  display: grid;
  place-items: center;
  grid-column: 2 / 4;
}

h1 {
  text-align: center;
}

.left {
  grid-column: 1;
  grid-row-start: 1;
}

.center {
  grid-column: 2 / 4;
  grid-row-start: 1;
}

.right {
  grid-column: 4;
  grid-row-start: 1;
}