*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f3f4f6;
  color: #1f2937;
  font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.site-header {
  padding: 0.75rem 1rem;
  background: #111827;
}

.site-name {
  display: inline-block;
  padding: 0.25rem 0;
  color: #fff;
  font-weight: 600;
  text-decoration: none;
}

.page {
  width: 100%;
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem;
}

.card {
  padding: 1rem;
  border-radius: 0.5rem;
  background: #fff;
  box-shadow: 0 1px 2px rgb(0 0 0 / 10%);
}

.card h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.card p {
  margin: 0;
}