CodePen

HTML

            
              <div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) {return;}
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>


<div class="fb-wrap">
  <h1>Responsive Facebook Like Box</h1>
<div class="fb-like-box" data-href="http://www.facebook.com/platform" data-width="992" data-show-faces="true" data-show-border="false" data-colorscheme="light" data-stream="false" data-header="false"></div>

</div>
            
          
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CSS

            
              .fb-wrap {
  width:50%;
  margin: 0 auto;
}

.fb-like-box, .fb-like-box span, .fb-like-box span iframe[style] { width: 100% !important; }
            
          
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JS

            
              
            
          
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