body {
  color: #666;
  background: #fff;
  font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  text-align: center;
  margin: 100px 20px;
  opacity: 0;
  animation: fadeIn 1s 1s forwards;
}
@keyframes fadeIn {
  to {
    opacity: 1;
    color: #666;
  }
}
p {
  margin: 4px auto;
}
a {
  color: #888;
  text-decoration: underline;
}
.fade-in {
  opacity: 0;
  color: #fff;
  transition: opacity 1s, color 1s;
}
.fade-in.visible {
  opacity: 1;
  color: #666;
}