body {
  background: #333;
  color: #fff;
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
}
.centerbox {
  width: 380px;
  margin: 120px auto 0 auto;
  padding: 38px 32px 32px 32px;
  background: #232323;
  border-radius: 16px;
  box-shadow: 0 0 28px #0007;
  text-align: center;
}
.centerbox h1 {
  margin-bottom: 18px;
  font-size: 2.1em;
  font-weight: 700;
}
.centerbox p {
  margin-bottom: 26px;
  color: #ccc;
  font-size: 1.1em;
}
.btn-group {
  display: flex;
  gap: 20px;
  justify-content: center;
}
.big-btn {
  font-size: 1.12em;
  padding: 15px 28px;
  background: #ad1a1a;
  color: #fff;
  border: none;
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.16s;
}
.big-btn:hover {
  background: #d12b2b;
}