JSFiddle - React, Tailwind, and code Playground

by ten1seven

HTML

<ul id="menu">
  <li>
    <a href="http://www.massgeneral.org/conditions/default.aspx">Conditions &amp; Treatments</a>
    <ul>
      <li><a href="http://www.massgeneral.org/conditions/default.aspx?cat=1001&catName=Allergy%20%26%20immunology">Allergy &amp; Immunology</a></li>
      <li><a href="http://www.massgeneral.org/conditions/default.aspx?cat=1002&catName=Blood">Blood</a></li>
    </ul>
  </li>
</ul>

CSS

#menu li ul {
  display: none;
}

#menu li:hover ul {
  display: block;
}