:root {
  font-family: Arial, Helvetica, sans-serif;
  color: #172033;
  background: #f4f7fb;
}
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
}
main {
  width: min(90%, 36rem);
  padding: 2rem;
  border-radius: 1rem;
  background: white;
  box-shadow: 0 8px 28px #17203314;
}
h1 { margin-top: 0; }