html {
  font-family: system-ui, sans-serif;
  background: #f5f5f5;
  color: #202020;
}
body {
  margin: 0;
}
main {
  max-width: 720px;
  margin: 10vh auto;
  padding: 2rem;
  background: white;
  border-radius: 12px;
}
h1 {
  margin-top: 0;
}