如何使用自定义css样式弹出选择菜单

<button id="menuButton">点击选择</button>
<div id="menuContainer">
  <ul>
    <li>选项1</li>
    <li>选项2</li>
    <li>选项3</li>
  </ul>
</div>

#menuContainer {
  display: none;
  position: absolute;
  top: 30px;
  left: 0;
  background-color: #fff;
  border: 1px solid #ccc;
  padding: 10px;
}

#menuContainer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

#menuContainer li {
  padding: 5px;
  cursor: pointer;
}

#menuContainer li:hover {
  background-color: #f5f5f5;
}

var menuButton = document.getElementById("menuButton");
var menuContainer = document.getElementById("menuContainer");

menuButton.addEventListener("click", function() {
  if (menuContainer.style.display === "none") {
    menuContainer.style.display = "block";
  } else {
    menuContainer.style.display = "none";
  }
});