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  <ul>
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  </ul>
</nav>

<header id="showcase">
  <h1>CSS Dropdown Menu</h1>
</header>

:root {
  --primary-color: coral;
  --secondary-color: chocolate;
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html,
body {
  background: #f4f4f4;
  font-family: Arial, Helvetica, sans-serif;
}

#navbar ul { list-style: none; }

#navbar ul li {
  position: relative;
  display: inline-block;
  padding: 1rem;
  color: #333;
}

#navbar ul li a {
  color: #333;
  text-decoration: none;
}

/* Hide nested ul by default */
#navbar ul li ul { display: none; }

#navbar ul li:hover {
  background: var(--primary-color);
  color: #fff;
  cursor: pointer;
}

#navbar ul li:hover a { color: #fff; }

/* Nested dropdown show */
#navbar ul li:hover ul {
  position: absolute;
  left: 0;
  display: block;
  width: 200px;
  margin-top: 1rem;
}

#navbar ul li:hover ul li {
  display: block;
  background: #e7e7e7;
}

#navbar ul li:hover ul li a { color: #333; }

#navbar ul li:hover ul li:hover {
  background: #e0e0e0;
  color: inherit;
}

#navbar ul li:hover ul li span {
  float: right;
  padding: 0.2rem 0.5rem;
  background: var(--primary-color);
  color: #fff;
  font-size: 0.8rem;
  text-align: center;
  border-radius: 5px;
}

#navbar ul li:hover ul li:hover span { background: var(--secondary-color); }

#showcase {
  display: flex;
  flex-direction: column;
  height: 300px;
  padding: 0 2rem;
  background: var(--primary-color);
  text-align: center;
  align-items: center;
  justify-content: center;
}

#showcase h1 {
  color: #fff;
  font-size: 4rem;
}


@media(max-width: 600px) {
  #navbar ul li { display: block; }

  #navbar ul li:hover ul {
    position: relative;
    width: 100%;
  }
}