title: Add 'Active' class to URL Hash Navigation button
body: <p><a href="https://owlcarousel2.github.io/OwlCarousel2/demos/urlhashnav.html" rel="nofollow noreferrer">https://owlcarousel2.github.io/OwlCarousel2/demos/urlhashnav.html</a></p>
  
  <p>How can I add 'active' class to the buttons?</p>
  
  <p>Currently buttons have a button.secondary:hover &amp; button.secondary:focus
  to create a button background color change.</p>
  
  <p>This is fine, except whenever clicking anywhere in the slider the focus is changed and so the background color is removed from the button.</p>
  
  <p>I need the buttons to have a dedicated active state, so that clicking within the slider is possible.</p>
  
  <p>Thanks</p>