我应该应用什么css样式才能获得与附加的mac声音弹出窗口相同的效果

.notification {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #f1f1f1;
  border: 1px solid #ccc;
  border-radius: 5px;
  padding: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  z-index: 9999;
}

.notification-title {
  font-weight: bold;
  margin-bottom: 5px;
}

.notification-message {
  margin-bottom: 10px;
}

.notification-button {
  background-color: #007bff;
  color: #fff;
  border: none;
  padding: 5px 10px;
  border-radius: 3px;
  cursor: pointer;
}

.notification-button:hover {
  background-color: #0056b3;
}

<div class="notification">
  <div class="notification-title">通知标题</div>
  <div class="notification-message">这是一条通知消息。</div>
  <button class="notification-button">关闭</button>
</div>