Edit in JSFiddle

<div>
  <ul>
    <li class='lista1'>
      <a href="#">Menu Dropdown</a>
      <ul class='lista2'>
        <li class='lista-link'><a class='link' href="#">Link 1</a></li>
        <li class='lista-link'><a class='link' href="#">Link 2</a></li>
        <li class='lista-link'><a class='link' href="#">Link 3</a></li>
      </ul>
    </li>
  </ul>
</div>

*{
  margin: 0;
}

div {
  background-color: yellow;
}

div a {
  text-decoration: none;
  color: black;
  font-size: 20px;
  font-weight: 600;
  padding: 15px;
  display:inline-block;
}

ul {
  display: inline;
  margin: 0;
  padding: 0;
}

.lista1 {
  display: inline-block;
}

.lista1:hover {
  background: #333;
}

.lista1:hover .lista2 {
  display: block;
}

.lista2 {
  position: absolute;
  width: 200px;
  display: none;
}

.lista-link {
  background: #555;
  display: block;
}

.link {
  display:block !important;
}

.lista-link:hover {
  background: #666;
}