我不认为这是一个好主意，使用引导只与css。如果你确实绝对想这样做，你可以尝试这样做

<link href="https://cdn.jsdelivr.net/npm/bootstrap@latest/dist/css/bootstrap.min.css" rel="stylesheet"/>
<div class="modal text-center show" tabindex="-1" id="withScrollExampleModal" style="display: block">
  <div class="modal-dialog modal-dialog-centered modal-dialog-scrollable">
    <div class="modal-content">
      <div class="modal-header">
        <h4 class="modal-title fw-normal">Basic dialogue title</h4>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close">
          <i class="fa-light fa-circle-xmark"></i>
        </button>
      </div>
      <div class="modal-body f-14">
        <p>Lorem ipsum dolor sit amet consectetur. Enim libero commodo nibh vitae sed laoreet magna dui pharetra.
        </p>
      </div>
      <div class="modal-footer d-flex justify-content-center">
        <button type="button" class="btn btn-secondary rounded-pill" data-bs-dismiss="modal">Action 1</button>
        <button type="button" class="btn btn-outline-primary rounded-pill">Action 2</button>
      </div>
    </div>
  </div>
</div>

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你需要在modal上添加show css类，并在div上设置display: block。但是如果没有js，你将看不到过渡，背景或关闭模型。
Bootstrap建议在angular中使用https://ng-bootstrap.github.io/

Bootstrap内置了打开和关闭modals的函数。例如，有一个按钮应该打开一个modal，在该按钮中需要一个数据切换，如data-toggle="modal"和modal的目标id，如data-target="#Id of the modal"。此外，modal本身必须有一个名为“modal”的类和一个id。这个id必须与data-target相同。下面是一个modal的例子。

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

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要做到这一点，请确保在head中导入以下项

<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://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

型
有关bootstrap中模态的更多信息，请访问以下链接https://getbootstrap.com/docs/4.0/components/modal/