技术咨询：如何缩小Bootstrap网格之间的间距？

Here's your formatted HTML code snippet presented in a code block for clarity:

<div class=""> 
  <!-- form start --> 
  <form class="form-horizontal"> 
    <div class="box-body"> 
      <div class="form-group"> 
        <div class="col-sm-3"></div> 
        <div class="col-sm-2">
          <label for="inputEmail3" class="control-label pull-left">Old Password</label>
        </div> 
        <div class="col-sm-3"> 
          <input type="password" class="form-control" id="txtOldPassword" onchange="DoACommon...
        </div>
      </div>
    </div>
  </form>
</div>

Quick heads-up: This is a partial snippet since it cuts off mid-onchange attribute. If you're working through a specific issue (like layout alignment, the DoACommon function's behavior, or form validation), sharing the full code or your exact goal would help narrow things down further!

内容的提问来源于stack exchange，提问作者Breathing