Bootstrap 4列大小调整在Google Chrome中无效

使用Bootstrap网格并在最小列大小以下调整页面大小时,我的列不会自动堆叠.最小尺寸的列甚至无法识别,只有第二大的列大小才能正常工作.如果它在Firefox和Atom HTML Preview中没有按预期工作,我会假设我错误地使用了网格.

这是我的代码......

<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>bootstrap interface</title>
    <link rel="stylesheet" href="css/bootstrap.css">
  </head>
  <body>

    <div class="container">
      <div class="row">
        <div class="col-sm-4 col-md-6 col-lg-12" style="background-color: red">
          <h1>Red</h1>
        </div>
        <div class="col-sm-4 col-md-6 col-lg-6" style="background-color: white">
          <h1>White</h1>
        </div>
        <div class="col-sm-4 col-md-12 col-lg-6" style="background-color: blue">
          <h1>Blue</h1>
        </div>
      </div>
    </div>

    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="js/bootstrap.bundle.min.js"></script>

  </body>
</html>

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