角度下拉消失

<div class="dropdown">
  <button class="trigger">点击我</button>
  <ul class="menu">
    <li>菜单项1</li>
    <li>菜单项2</li>
    <li>菜单项3</li>
  </ul>
</div>

.dropdown {
  position: relative;
  display: inline-block;
}

.trigger {
  background-color: #f1f1f1;
  border: none;
  padding: 10px;
  cursor: pointer;
}

.menu {
  position: absolute;
  top: 100%;
  left: 0;
  transform-origin: top left;
  transform: scaleY(0);
  transition: transform 0.3s ease-in-out;
  background-color: #f1f1f1;
  list-style: none;
  padding: 0;
  margin: 0;
}

.menu li {
  padding: 10px;
}

.dropdown:hover .menu {
  transform: scaleY(1);
}