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>
