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HTML CSS燒瓶自舉罐& # 39；t對齊DIV？

CSS
洪振霞2年前8瀏覽0評論

為什么我不能將這個div與bootstrap和flask對齊？

{% extends "_base.html" %}
{% block content %}

<h1 class="text-center">Welcome {{current_user.email}}!</h1>
<div class="input-group mb-3-center">
    <div class="input-group-prepend">
      <label class="input-group-text" for="inputGroupSelect01">Options</label>
    </div>
    <select class="custom-select" id="inputGroupSelect01">
      <option selected>Choose...</option>
      <option value="1">One</option>
      <option value="2">Two</option>
      <option value="3">Three</option>
    </select>
  </div>
{% endblock %}

我也嘗試過文本中心，但只適用于選項文本。

謝謝，請放心，我是bootstrap新手。通常我只使用html標簽，但這當然不起作用。

我的base.html，里面有引導css的參考:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Flask User Management</title>
    <!-- meta -->
    <meta name="description" content="">
    <meta name="author" content="">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <!-- styles -->
    <!-- CSS only -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-gH2yIJqKdNHPEq0n4Mqa/HGKIhSkIHeL5AyhkYV8i59U5AR6csBvApHHNl/vI1Bx" crossorigin="anonymous">
    <link rel="stylesheet" href="{{url_for('static', filename="styles.css")}}">
    {% block css %}{% endblock %}
  </head>
  <body>

    {% include "navigation.html" %}

    <div class="container">

      <br>

      <!-- messages -->
      {% with messages = get_flashed_messages(with_categories=true) %}
      {% if messages %}
      <div class="row">
        <div class="col-md-4"></div>
        <div class="col-md-4">
          {% for category, message in messages %}
          <div class="alert alert-{{ category }} alert-dismissible fade show" role="alert">
           {{message}}
           <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
          </div>
          {% endfor %}
        </div>
        <div class="col-md-4"></div>
      </div>
      {% endif %}
      {% endwith %}

      <!-- child template -->
      {% block content %}{% endblock %}

    </div>

    <!-- scripts -->
    <script src="https://code.jquery.com/jquery-3.6.1.min.js" type="text/javascript"></script>
    <!-- JavaScript Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-A3rJD856KowSb7dwlZdYEkO39Gagi7vIsF0jrRAoQmDKKtQBHUuLZ9AsSv4jD4Xa" crossorigin="anonymous"></script>
    {% block js %}{% endblock %}

  </body>
</html>

# # #解決方案1

要將下拉列表及其相應的標簽居中:

{% extends "_base.html" %}
{% block content %}

<h1 class="text-center">Welcome {{current_user.email}}!</h1>
<div class="input-group mb-3-center" style="display: flex;justify-content: center;">
    <div class="input-group-prepend">
      <label class="input-group-text" for="inputGroupSelect01">Options</label>
    </div>
    <select class="custom-select" id="inputGroupSelect01">
      <option selected>Choose...</option>
      <option value="1">One</option>
      <option value="2">Two</option>
      <option value="3">Three</option>
    </select>
</div>
</div>
{% endblock %}

利用Flexbox，我添加了style = & quot顯示器:flexjustify-content:居中；"到最外面的分區。查看此SO問題，了解關于在另一個元素中水平居中一個元素的更多選項。

解決方案2

第一種解決方案是將下拉列表和標簽居中，但是標簽將位于下拉列表的一側，而不是頂部。這是將兩個元素居中的解決方案，同時還將標簽放在下拉列表的頂部。

{% extends "_base.html" %}
{% block content %}

<h1 class="text-center">Welcome {{current_user.email}}!</h1>
<div class="input-group mb-3-center" style="display: flex;flex-direction: column;align-items: center;">
    <div class="input-group-prepend">
      <label class="input-group-text" for="inputGroupSelect01">Options</label>
    </div>
    <select class="custom-select" id="inputGroupSelect01">
      <option selected>Choose...</option>
      <option value="1">One</option>
      <option value="2">Two</option>
      <option value="3">Three</option>
    </select>
</div>
</div>
{% endblock %}

如你所見，我仍然使用flexbox，但是現在我將flex-direction設置為column，并將項目對齊到中心。