body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f6f7f9;
  color: #222;
}
main {
  max-width: 760px;
  margin: 12vh auto;
  padding: 32px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(0,0,0,.08);
}
h1 { margin-top: 0; }
.muted { color: #666; }