html,
body {
  height: 100%;
  box-sizing: border-box;
  margin: 0;
}

body {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(384px, 1fr));
  gap: 1em;
  padding: 1em;
  align-items: center;
}

body > * {
  justify-self: center;
}