JSFiddle - React, Tailwind, and code Playground

HTML

<div class="navigationWrap">
  <ul>
    <li class="dropdown">&#9776; See Options<ul class="subNav">
        <li><a href="#">Option 1</a></li>
        <li><a href="#">Option 2</a></li>
        <li><a href="#">Option 3</a></li>
        <li><a href="#">Option 4</a></li>
        <li><a href="#">Option 5</a></li>
        <li>
          <p></p>
        </li>
        <li><a href="#">Option 6</a></li>
        <li><a href="#">Option 7</a></li>
      </ul>
    </li>
  </ul>
</div>

CSS

ul {
  padding: 15px;
  list-style: none;
  text-align: center;
}

.navigationWrap ul li {
  width: 100%;
  float: left;
  color: #000;
  font-size: 16px;
  position: relative;
}

.navigationWrap ul li a {
  text-decoration: none;
  color: #000;
  display: block;
}

.navigationWrap ul li a:hover {
  color: #000;
  background-color: #e6ffe6;
}

.navigationWrap ul li ul.subNav {
  position: absolute;
  width: 95%;
  padding: 10px;
  background-color: #fff;
  border: #4399fc solid 1px;
  display: none;
  z-index: 999;
  left: 0;
  top: 100%;
  text-align: left;
  max-height: 350px;
  overflow: auto;
  overflow-x: hidden;
}

.navigationWrap ul li ul.subNav li {
  float: left;
  width: 100%;
  font-size: 20px;
  letter-spacing: 1px;
  padding-bottom: 10px;
}

.navigationWrap ul li ul.subNav a {
  float: left;
  width: 100%;
  transition: all 0.3s ease-in-out;
  display: block;
}

.navigationWrap ul li ul.subNav li a:hover {
  color: #000;
  padding-left: 10px;
}

.navigationWrap ul li ul.subNav li.active a {
  color: #04A000;
}

.navigationWrap ul li.dropdown:hover ul.subNav {
  display: block;
}