title: How can I create a pop-up menu with jQuery?
body: <p>I've been learning to code by my own and I was wondering how can I achieve this kind of stuff, after having clicking a button and then obviously apply the changes the user wants, like this example in eBay:</p>
  
  <p><img src="https://i.stack.imgur.com/kQgbj.png" alt="eBay example"></p>
  
  <p>I know PHP and JavaScript and how Ajax works. You don't need to code it for me but at least give some good approaches.</p>
  
  <p>What is this technically called?<br>
  so I can look into it because I can't find anything in Google about 'pop-up menus' so I know that's not how they are called.</p>