html,
body {
  height: 100%;
  margin: 0;
  background: #fff;
}

main {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
  box-sizing: border-box;
}

.notice {
  display: block;
  width: min(640px, 100%);
  height: auto;
}