JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<body>
  <div class="dropdown-content">
    <a>1</a>
    <a>2</a>
  </div>
  <script>
    window.onclick = function(event){
      if($(event.target).closest('.dropdown-content').length){
        alert("foo");
      }   
    };
  </script>
</body>

CSS

.dropdown-content a{
                display: block;
                background-color: blue;
            }