body {
  background: #f3f3f1;
}

.paper {
  width: min(100%, var(--screen-width, 58rem));
  margin: 0 auto;
  padding: 0 var(--page-inline);
  background: var(--paper);
  box-shadow: 0 0 32px rgb(0 0 0 / 8%);
}

@media (max-width: 640px) {
  .paper {
    padding-inline: 1.25rem;
    box-shadow: none;
  }

  .cover h1 {
    font-size: 3rem;
  }
}