custom ad doesn't work

I created a custom ad with the following code:

<div class="td-all-devices">
 <a href="http://www.dedrieolifanten.nl"><img src="http://ollekebolleke.info/wp-content/uploads/2016/03/3_olifanten-3.jpg" alt="de drie olifanten" /></a>
</div>

I placed this adbox on above the newsticker on top and at above the footer on the bottom of the page, but nothing shows up.
http://www.ollekebolleke.info

What am I doing wrong here?

Very strange. I can’t see it on my laptop (Ubuntu, with Firefox). However, I can see the add perfectly on my tablet. I just removed the top ad, the bottom add is still there.

HI

I’ve checked your site and the ad is properly displayed on header: http://screencast.com/t/2yx1ht5oPC and also above footer: http://screencast.com/t/NGcUViMv If you still have this issue try to clear browser’s cache memory then test the site again, also make sure that you don’t have any ad-block extension enabled on the browser.

Thanks!