:root {
  font-family: system-ui, sans-serif;
  color: #172033;
  background: #f4f7fb;
}
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
}
main {
  width: min(640px, 82vw);
  padding: 48px;
  background: white;
  border-radius: 18px;
  box-shadow: 0 12px 40px #18243a18;
}
h1 { margin-top: 0; }
p { line-height: 1.7; color: #536078; }