.call-button {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  background-color: #28a745; /* 綠色 */
  color: #fff;
  font-weight: bold;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: background-color 0.3s ease;
}
.call-button:hover {
  background-color: #218838;
}
.call-button svg {
  width: 20px;
  height: 20px;
  margin-right: 8px;
  fill: currentColor;
}