* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: #171717;
  background: #f6f6f3;
}
.card {
  width: min(560px, 100%);
  background: #fff;
  border: 1px solid #e5e5e0;
  border-radius: 20px;
  padding: 48px 32px;
  text-align: center;
  box-shadow: 0 12px 35px rgba(0,0,0,.06);
}
.mark {
  width: 62px;
  height: 62px;
  margin: 0 auto 22px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  background: #171717;
  color: #fff;
  font-weight: 800;
  letter-spacing: .04em;
}
h1 { margin: 0 0 14px; font-size: clamp(28px, 6vw, 42px); line-height: 1.08; }
p { margin: 8px 0; font-size: 18px; line-height: 1.5; }
.small { color: #6a6a64; font-size: 15px; }