コードを書くときは、ある程度まとめちゃう

  section div.section-inner{
    position: relative;
  }
  section div.section-inner:before{
    position: absolute;
    font-family: "Poiret One","ヒラギノ角ゴ ProN W3","Hiragino Kaku Gothic ProN W3",Meiryo,"ＭＳ Ｐゴシック",sans-serif;
    border-bottom: 1px dotted #040000;
  }
  section div.section-inner:after{
    content: "";
  }

とかいうlessがあったら、もうこれはひとつに纏めるチャンスです

  section div.section-inner{
    position: relative;
    &:before{
      position: absolute;
      font-family: "Poiret One","ヒラギノ角ゴ ProN W3","Hiragino Kaku Gothic ProN W3",Meiryo,"ＭＳ Ｐゴシック",sans-serif;
      border-bottom: 1px dotted #040000;
    }
    &:after{
      content: "";
    }
  }

こんな風に。