bootstrap中让row之间距离增加

用

<div class="clearfix" style="margin-bottom: 10px;"></div>

比如：

<div class="container">
    <div class="row">
    <div class="col-xs-11">     
      <%= f.text_field :title, type: "text", class: "form-control", placeholder: "请输入标题"  %>
    </div>
  </div>

<div class="clearfix" style="margin-bottom: 10px;"></div>

  <div class="row">
    <div  class="col-xs-11">
      <%= f.kindeditor :content, height: 400, placeholder: @blog.errors[:content].join("") %>
    </div>
  </div>

<div class="clearfix" style="margin-bottom: 10px;"></div>

  <div class="row">
      <div class="col-xs-11"><%= f.submit "提交", class: "btn btn-primary" %></div>
  </div>
  <% end %>

</div>