.center-wrapper {
  display: flex;
  justify-content: center;  /* horizontal center */
  align-items: center;      /* vertical center */
  height: 100vh;            /* full viewport height */
}

.button-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;          /* mobile friendly */
}

.btn {
  padding: 12px 20px;
  background-color: #007aff;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}

.btn:hover {
  background-color: #005bb5;
}