.issue_form_box { 
  @extend .main_box;
  .issue_title { 
    @extend .top_box_content;
    .clearfix { 
      margin-bottom:0px; 
      input { 
        @extend .span8;
      }
    }
  }
  .issue_middle_block { 
    @extend .middle_box_content;
    height:30px;
    .issue_assignee { 
      @extend .span6;
      float:left;
    }
    .issue_milestone { 
      @extend .span4;
      float:left;
    }
  }
  .issue_description { 
    @extend .bottom_box_content;
  }
}