* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: #f6f4ee;
  color: #1f2a44;
  display: grid;
  place-items: center;
}
main { padding: 24px; }
.caja {
  max-width: 420px;
  background: #fff;
  border: 1px solid #e0dccf;
  border-radius: 10px;
  padding: 30px;
  text-align: center;
}
h1 { margin-bottom: 12px; font-size: 1.6em; }
.lead { color: #5b6478; margin-bottom: 16px; }
.small { font-size: 0.85em; color: #5b6478; }
a { color: #b3202b; text-decoration: none; }
a:hover { text-decoration: underline; }