Не скрывается блок в bootstrap (hidden-md hidden-lg)

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<link href="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet"/> 
<script src="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script> 
<div class="section-content"> 
            <div class="row"> 
                <div class="feature-item col-lg-3 col-sm-6 wow slideInUp" style="visibility: visible;"> 
                    <div class="feature-media"> 
                        <img src="http://placehold.it/112x112" width="112" height="112" alt="текст" title="текс"> 
                    </div> 
                    <h4>Текст</h4> 
                    <div class="feature-item-content">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500. Lorem Ipsum has been the industry's standard dummy</div> 
                </div> 
				<div class="feature-item col-lg-3 col-sm-6 wow slideInUp" style="visibility: visible;"> 
                    <div class="feature-media"> 
                        <img src="http://placehold.it/112x112" width="112" height="112" alt="текст" title="текс"> 
                    </div> 
                    <h4>Текст</h4> 
                    <div class="feature-item-content">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy</div> 
                </div> 
				<div class="clearfix hidden-md hidden-lg"></div> 
				<div class="feature-item col-lg-3 col-sm-6 wow slideInUp" style="visibility: visible;"> 
                    <div class="feature-media"> 
                        <img src="http://placehold.it/112x112" width="112" height="112" alt="текст" title="текс"> 
                    </div> 
                    <h4>Текст</h4> 
                    <div class="feature-item-content">Lorem Ipsum is simply</div> 
                </div> 
				<div class="feature-item col-lg-3 col-sm-6 wow slideInUp" style="visibility: visible;"> 
                    <div class="feature-media"> 
                        <img src="http://placehold.it/112x112" width="112" height="112" alt="текст" title="текс"> 
                    </div> 
                    <h4>Текст</h4> 
                    <div class="feature-item-content">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500. Lorem Ipsum has been</div> 
                </div> 
            </div>