body.fade-in {
  animation: fadein 0.5s ease-in;
}

@keyframes fadein {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.page-wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem;
}

@media (max-width: 600px) {
  .page-wrapper {
    padding: 1rem;
  }
}