html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  display: grid;
  /* Defines 3 rows: auto for header, 1fr for main content, auto for footer */
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  font-family: sans-serif;
}

header {
  background-color: #a0c4ff;
  padding: 1rem;
  grid-row: 1;
  text-align: center;
}

main {
  background-color: #b8e0d2;
  padding: 1rem;
  grid-row: 2;
}

footer {
  background-color: #ffc4e1;
  padding: 1rem;
  text-align: center;
  grid-row: 3;
  color: #444;
}