<body>
  <div class="dropdown">
    <div>
      Menu
    </div>
    <div class="menu">
      <div>Item1</div>
      <div>Item2</div>
      <div>Item3</div>
    </div>
  </div>
</body>
.dropdown {
  position: relative;
  background: #ffeeee
}

.menu {
  position: absolute;
  visibility: hidden;
  background: #eeffee;
}

.dropdown:hover .menu {
  visibility: visible;
}
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