drop down menu

HTML
<!DOCTYPE html>
<html>
<head>
<style>
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  padding: 12px 16px;
  z-index: 1;
}

.dropdown:hover .dropdown-content {
  display: block;
}
</style>
</head>
<body>

<h2>Hoverable Dropdown</h2>
<p>Move the mouse over the text below to open the dropdown content.</p>

<div class="dropdown">
  <span>Mouse over me</span>
  <div class="dropdown-content">
  <p>Hello World!</p>
  </div>
</div>

</body>
</html><!-- Answer to: "drop down menu html" -->

<label for="items">Choose an item:</label>

<select id="things">
  <option value="thing-1">Thing 1</option>
  <option value="thing-2">Thing 2</option>
  <option value="thing-3">Thing 3</option>
  <option value="thing-4">Thing 4</option>
</select><style>
/* Style The Dropdown Button */
.dropbtn {
  
background-color: #4CAF50;
  color: white;
  
padding: 16px;
  font-size: 16px;
  
border: none;
  cursor: pointer;
}

/* The 
container <div> - needed to position the dropdown content */
.dropdown {

    position: relative;
  display: 
inline-block;
}

/* Dropdown Content (Hidden by Default) */

.dropdown-content {
  display: none;
  position: 
absolute;
  background-color: #f9f9f9;
  
min-width: 160px;
  box-shadow: 
0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* Links inside the dropdown */

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;

    
display: block;
}

/* Change color of dropdown links on hover */

.dropdown-content a:hover {background-color: #f1f1f1}

/* Show the 
dropdown menu on hover */
.dropdown:hover .dropdown-content {
  
display: block;
}

/* Change the background color of the dropdown 
button when the dropdown content is shown */
.dropdown:hover .dropbtn {
  background-color: #3e8e41;
}
</style>

<div class="dropdown">
  <button class="dropbtn">Dropdown</button>
  
<div class="dropdown-content">
    <a href="#">Link 
1</a>
    
<a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>  <div class="dropdown">
  <button class="dropbtn">Dropdown</button>
  
<div class="dropdown-content">
    <a href="#">Link 
1</a>
    
<a href="#">Link 2</a>
    <a href="#">Link 3</a>
  </div>
</div>
Source