How to create a clickable dropdown menu with CSS and JavaScript?

Following is the code to create a clickable dropdown menu using CSS and JavaScript −

Example

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
.menu-btn {
   background-color: #7e32d4;
   color: white;
   padding: 16px;
   font-size: 20px;
   font-weight: bolder;
   font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
   border: none;
}
.dropdown-menu {
   position: relative;
   display: inline-block;
}
.menu-content {
   display: none;
   position: absolute;
   background-color: #017575;
   min-width: 160px;
   z-index: 1;
}
.links {
   color: rgb(255, 255, 255);
   padding: 12px 16px;
   text-decoration: none;
   display: block;
   font-size: 18px;
   font-weight: bold;
   border-bottom: 1px solid black;
}
.links:hover {
   background-color: rgb(8, 107, 46);
}
.dropdown-menu:hover .menu-btn {
   background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>Click on the below dropdown button to open/close dropdown menu</h2>
<div class="dropdown-menu">
<button class="menu-btn">Open <</button>
<div class="menu-content">
<a class="links" href="#">Contact Us</a>
<a class="links" href="#">Visit Us</a>
<a class="links" href="#">About Us</a>
</div>
</div>
<script>
let dropdownBtn = document.querySelector('.menu-btn');
let menuContent = document.querySelector('.menu-content');
dropdownBtn.addEventListener('click',()=>{
   if(menuContent.style.display===""){
      menuContent.style.display="block";
   } else {
      menuContent.style.display="";
   }
})
</script>
</body>
</html>