html - Hide div on mobile devices, using CSS

Question

I want to hide a div containing the facebook likebox widget from mobile devices. I tried this but it doesn't work.

div code:

<div id="facebook" class="fb-like-box mobile-hide" data-href="https://www.facebook.com/mypage" data-width="220" data-height="250" data-show-faces="true" data-stream="false" data-header="true"></div>

css code:

@media screen and (min-width: 0px) and (max-width: 720px) {
  #facebook { display: none; }
  .mobile-hide{ display: none; }
}

What am i doing wrong? It does not work using the id or the class reference.

Answer 1

For some reason (unknown to me) this worked:

<div  class="mobile-hide">
<div class="fb-like-box" data-href="https://www.facebook.com/mypage" data-width="220" data-height="250" data-show-faces="true" data-stream="false" data-header="true"></div>
</div>