引导4:网格单元内内容右对齐

小屏幕上的以下HTML导致列重叠:

<link rel=“stylesheet”href=“https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css”integrity=“sha384-mcw98/sfnge8fjt3gxweongsv7zt27nxfoaapmym81iuxopkfojwj8erdknlpmo”crossorigin=“anonymous”>

<script src=“https://code.jquery.com/jquery-3.3.1.slim.min.js”integrity=“sha384-q8i/x+965dzo0rt7abk41jstqaqvgrvzpbzo5smxkp4yfferh+8abtte1pi6jizo”crossorigin=“anonymous”></script>
<script src=“https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js”integrity=“sha384-zmp7rvo3miykv+2+9j3uj46jbk0wlaudn689acwoqbbjisnjak/l8wvcwpipm49”crossorigin=“anonymous”></script>
<script src=“https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js”integrity=“sha384-chfqqxuzucnjsk3+mxmpniye6zbwh2imqe241ryiqjxymizz6ow/jmzq5stweulty”crossorigin=“anonymous”></script>

<DIV class=“row”>
<DIV class=“col-sm-1”>
<A class=“btn btn secondary”>新建</A>
&L/DIV & GT;
<DIV class=“col-sm-8”>
<form method=“获取”>
<DIV class=“行表单组”>
<DIV class=“col-8”>
<input name=“custname”value=“”class=“form control”placeholder=“customer”/>gt;
&L/DIV & GT;
<DIV class=“col-4”>
<button type=“button”class=“btn btn secondary”>搜索</button>
<button type=“button”class=“btn btn secondary”>清除</button>
&L/DIV & GT;
&L/DIV & GT;
&表格/表格;
&L/DIV & GT;
<DIV class=“col-sm-3”>
<nav aria label=“分页”>
<ul class=“pagination float right”>
<li><a class=“page link”href=“”>预览</a></li>
<li><a class=“page link”href=“”>1</a></li>
<li><a class=“page link”href=“”>2</a>/lt;/li>
<li><a class=“page link”href=“”>3</a></li>
<li><a class=“page link”href=“”>下一步</a></li>
&L/UL & GT;
&;
&L/DIV & GT;
</DIV>>=

我需要右对齐导航元素。如何防止柱重叠?

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

<div class="row">
  <div class="col-sm-1">
    <a class="btn btn-secondary">New</a>
  </div>
  <div class="col-sm-8">
    <form method="get">
      <div class="row form-group">
        <div class="col-8">
          <input name="custName" value="" class="form-control" placeholder="Customer" />
        </div>
        <div class="col-4">
          <button type="button" class="btn btn-secondary">Seach</button>
          <button type="button" class="btn btn-secondary">Clear</button>
        </div>
      </div>
    </form>
  </div>
  <div class="col-sm-3">
    <nav aria-label="Pagination">
      <ul class="pagination float-right">
        <li><a class="page-link" href="#">Prev</a></li>
        <li><a class="page-link" href="#">1</a></li>
        <li><a class="page-link" href="#">2</a></li>
        <li><a class="page-link" href="#">3</a></li>
        <li><a class="page-link" href="#">Next</a></li>
      </ul>
    </nav>
  </div>
</div>

我需要右对齐导航元素。如何防止柱重叠?