<style type="text/css">
  #partnaire dt div > span:after, #partnaire dt div > span:before {
    content: "";
    position: absolute;
    top: 50%;
    width: 9999px;
    height: 1px;
    background: #eee;
  }

  #partnaire dt div > span:before {
    right: 100%;
  }

  #partnaire dt div > span:after {
    left: 100%;
  }
</style> 
<div style="padding-top: 10px;"><dl id="partnaire"></dd></dl></div>