How to use keyboard arrows to navigate in the dropdown

I have a simple dropdown and I want to have the possibility that the user can navigate via keyboard arrows (up/down) in the dropdown.

Here is the code:

function myFunction() {

window.onclick = function(event) {
  if (!'.dropbtn')) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
.dropbtn {
  background-color: #3498DB;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;

.dropbtn:hover, .dropbtn:focus {
  background-color: #2980B9;

.dropdown {
  position: relative;
  display: inline-block;

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  overflow: auto;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;

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

.dropdown a:hover {background-color: #ddd;}

.show {display: block;}
<div class="dropdown">
  <button onclick="myFunction()" class="dropbtn">Dropdown</button>
  <div id="myDropdown" class="dropdown-content">
    <a href="#home">Home</a>
    <a href="#about">About</a>
    <a href="#contact">Contact</a>

This works fine when I am using tab, but I want to use arrows (up/down), can anybody try to help me with this?

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