* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #17202a;
  background: #f4f6f8;
}

.card {
  width: min(100%, 520px);
  padding: 32px;
  text-align: center;
  background: #fff;
  border: 1px solid #e3e7eb;
  border-radius: 16px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, .06);
}

h1 { margin-top: 0; }
p { line-height: 1.6; }
a { color: #075fe4; font-weight: 600; }