CodePen

HTML

            
              <div id="slider">
<div class="1sthalf">
first half
</div> <!--first half-->
<div class="2ndhalf">
second half
</div> <!--second half-->
</div> <!--slider-->
            
          
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CSS

            
              #slider {with:960px;height:400px;}
.1sthalf {width:480px;float:left;}
.2ndhalf {width:480px;}
            
          
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JS

            
              
            
          
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