Simple Pure CSS Drop Down Menu

<nav>
    <ul>
      <li><a href="#">Home</a></li>
      <li class="submenu"><a href="#">Portfolio</a>
        <ul >
          <li><a href="#">Animation</a></li>
          <li><a href="#">Game Design</a></li>
          <li><a href="#">Web Design</a></li>
        </ul>
      
      </li>
      <li><a href="#">About</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
</nav>
/*Styling the main menu*/
nav ul li {
  float: left;
  list-style: none;
}

nav ul li a {
  color: white;
  background: cornflowerblue;
  padding: 10px;
  text-decoration: none;
  display:inline-block;
  width: 100px;
}

nav ul li a:hover {
  background: cornflowerblue;
}

/* Styling the sub menu */
.submenu {
  position: relative;
}

.submenu ul {
  position: absolute;
  padding:0; 
  margin:0;
  display: none;
}

.submenu li{
  display: block;
  background: lightsteelblue;
  color: white;
  float: none;
  width: 100%;
}

/* Styling drop down links */
.submenu li a {
  background: transparent;
  padding:10px;
  display: block;
}

.submenu li a:hover {
  background: gray;
}

/* Showing Submenu on hover*/
.submenu:hover ul {
  display: block;
}


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