JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
  <a class="nav-btn">Logo</a>
  <ul>
     <li><a href="">Menu 1</a></li>
     <li><a href="">Menu 1</a></li>
     <li><a href="">Menu 1</a></li>
     <li><a href="">Menu 1</a></li>
     <li><a href="">Menu 1</a></li>
  </ul>
  <a class="nav-btn">Logo</a>
</nav>

CSS

a, li {
    display: block;
    width: 100px;
    height: 100px;
    background-color: red;
    float: left;
    border: 1px solid yellow;
    padding: 0;
    margin: 0;
}

ul {
    margin: 0;
    padding: 0;
    display: none;
}

nav:hover ul {
    display: block;
}