Webtags

<style type="text/css">

.c33-ul {
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style-type: none;
  background: linear-gradient(to right, #61ba6d, #83c331);
}

.c33-li {
  float: left;
}

.c33-li a, .c33-course {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 15px 17px 15px 17px;
  text-decoration: none;
}

.c33-li a:hover, .c33-dropdown:hover .c33-course {
  background-color: grey;
}

.c33-li .c33-dropdown {
  display: inline-block;
}

.c33-courses-menu {
  display: none;
  position: absolute;
  background-color: #f2f2f2;
  min-width: 155px;
  box-shadow: 0px 9px 17px 0px rgba(0,0,0,0.3);
  z-index: 1;
}

.c33-courses-menu a {
  color: black;
  padding: 13px 17px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.c33-courses-menu a:hover {
  background-color: lightgrey;
}

.c33-dropdown:hover .c33-courses-menu {
  display: block;
}

.active {

  background-color: green;
}

</style>



<ul class="c33-ul">
  <li class="c33-li active"><a href="#">Home</a></li>
  <li class="c33-li"><a href="#">About</a></li>
  <li class="c33-li c33-dropdown">
    <a href="#" class="c33-course">Courses</a>
    <div class="c33-courses-menu">
     <a href="#">Course 1</a>
     <a href="#">Course 2</a>
     <a href="#">Course 3</a>
    </div>
  </li>
</ul>