removing column padding or margins to create a tiling effect using bootstrap 3
  <div class="row">
  <div class="col-md-4">
    <div class="hexagon-wrapper hex_size">
        <div class="hexagon">
        </div>   
    </div>      
</div>
<div class="col-md-4">
    <div class="hexagon-wrapper hex_size">
        <div class="hexagon">
        </div>   
    </div>      
</div>  
<div class="col-md-4">
    <div class="hexagon-wrapper hex_size">
        <div class="hexagon">
        </div>   
    </div>      
</div>
  //row 2
  <div class="row">
  <div class="col-md-4">
    <div class="hexagon-wrapper hex_size">
        <div class="hexagon">
        </div>   
    </div>      
</div>
<div class="col-md-4 col-md-offset-2">
    <div class="hexagon-wrapper hex_size">
        <div class="hexagon">
        </div>   
    </div>      
</div>  
<div class="col-md-4">
    <div class="hexagon-wrapper hex_size">
        <div class="hexagon">
        </div>   
    </div>      
</div>
Result so far:
  
I need a class to add to row to push the 2nd row up by 50%.Its seems to be over written by Bootstrap.