* {
  box-sizing: border-box;
}
html {
  color: #000;
  background: #000;
}
body {
  position: relative;
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-start;
}
@media screen {
  body {
    margin-block: 2rem;
    gap: 2rem;
  }
}
body>section {
  width: 210mm;
  height: 297mm;
  background: #fff;
  position: relative;
  padding-block: 2rem;
  padding-inline: 2rem;
}