body {
  background: linear-gradient(135deg, #a8c0a0 0%, #d0e8c0 100%);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #333;
  padding-top: 50px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  background: white;
  border-radius: 12px;
  padding: 40px 50px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  max-width: 520px;
  width: 100%;
  max-height: 420px;
  overflow-y: hidden;
}

h1 {
  font-weight: 700;
  margin-bottom: 20px;
  color: #355e3b;
}

p {
  font-size: 1.1rem;
  margin-bottom: 30px;
  color: #4d6444;
}

.btn-group-vertical .btn {
  font-weight: 600;
  font-size: 1.1rem;
  border-radius: 8px;
  padding: 12px 0;
  background-color: #a3c9a8;
  color: #2e4b31;
  border: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn-group-vertical .btn:hover {
  transform: translateY(-3px);
  background-color: #87b58c;
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.btn-group-vertical .btn + .btn {
  margin-top: 15px;
}