body {
  font-family: sans-serif;
  background-color: #e0e0e0;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
}

.container {
  background: #f5f5f5;
  padding: 20px;
  margin-top: 40px;
  width: 360px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.queue-box {
  background-color: #ccc;
  padding: 20px;
  border-radius: 16px;
  height: 160px; /* fixed height */
  overflow-y: auto; /* enables vertical scrolling */
  margin-bottom: 10px;
}

.clear-btn {
  background-color: #999;
  border: none;
  padding: 6px 14px;
  color: white;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 20px;
}

.button-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.type-btn, .generate-btn {
  background-color: #116699;
  border: none;
  padding: 12px 18px;
  border-radius: 12px;
  color: white;
  font-size: 16px;
  cursor: pointer;
}

.generate-btn {
  width: 100%;
  margin-top: 10px;
}