CSS row类引发底部导航栏偏移问题排查及布局优化咨询

为实现两个元素并排，给元素添加row类后，底部导航栏被挤到可视区域外，必须滚动才能查看：

未使用row类的页面中，导航栏能完美固定在底部，页面可滚动但布局不符合需求——绿色框和编辑、删除按钮本该上下排列，用row类修正布局就触发了导航栏偏移的bug：

目标设计效果：

需要找出row类导致bug的原因，以及能避免该问题的元素并排布局方案。

相关代码 #

问题CSS代码 #

.row {
    display: flex;
    align-items: center;
    border-bottom: 1px solid #bdbdbd;
    font-family: 'Montserrat', sans-serif;
}

.CheckButton {
    margin-left: 30px;
    width: 60px;
    height: 80px;
}

.ReminderDescription {
    flex-grow: 1;
    font-weight: bold;
    margin-right: 80px;
}

引发问题的HTML片段 #

{% block content %}
  {% for reminderInstance in Reminders %}
  <div class="row">
    <div class="CheckButton">
      <form action="{{ url_for('reminder', Plant_id = reminderInstance.Plant_id) }}">
        <button class="NewButton NewButton1"></button>
      </form>
    </div>
    <div class="ReminderDescription "> Give {{ reminderInstance.Plant_name }} water {{ reminderInstance.TimeSinceWaterNeeded }} days ago </div>
  </div>
  {% endfor %}
{% endblock %}

完整Reminders页面HTML #

<!DOCTYPE html>
<html>
    <head>
        <title> Reminders </title>
        <meta name="viewport" content="width=devide-width, initial-scale=1.0">
        <meta charset="utf-8">
        <link rel="shortcut icon" href="/assets/favicon.ico">
        <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
        <link rel= "stylesheet" type= "text/css" href= "{{ url_for('static',filename='src/nav.css') }}">
        <link rel= "stylesheet" type= "text/css" href= "{{ url_for('static',filename='src/Collection.css') }}">
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
    </head>
    <body>
        <nav class="nav">
          <a href="{{ url_for('collection') }}" class="nav__link">
            <span class="nav__text">Collection</span>
          </a>
          <a href="{{ url_for('index') }}" class="nav__link">
            <span class="nav__text">Home</span>
          </a>
          <a href="{{ url_for('reminders') }}" class="nav__link nav__link--active">
            <span class="nav__text">Reminders</span>
          </a>
        </nav>
    </body>
</html>

{% block content %}
  {% for reminderInstance in Reminders %}
  <div class="row ">
    <div class="CheckButton ">
      <form action="{{ url_for('reminder', Plant_id = reminderInstance.Plant_id) }}">
        <button class="NewButton NewButton1"></button>
      </form>
    </div>
    <div class="ReminderDescription "> Give {{ reminderInstance.Plant_name }} water {{ reminderInstance.TimeSinceWaterNeeded }} days ago </div>
  </div>
  {% endfor %}
{% endblock %}

导航栏CSS #

body {
    margin: 0 0 55px 0;
}

.nav {
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 55px;
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.2);
    background-color: #4ea662;
    display: flex;
    overflow-x: auto;
}

.nav__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    min-width: 50px;
    overflow: hidden;
    white-space: nowrap;
    font-family: 'Montserrat', sans-serif;
    font-weight: bold;
    font-size: 15px;
    color: #ffffff;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.1s ease-in-out;
}

.nav__link:hover {
    background-color: #eeeeee;
}

.nav__link--active {
    padding: 2px 4px;
    border: none;
    text-align: center;
    border-radius:5px;
    background-color: #468454;
    color: #ffffff;
}

问题原因 #

你引入了Bootstrap 3样式，它默认给.row类设置了margin-left: -15px和margin-right: -15px的负边距，这个样式会让你的.row元素超出父容器宽度，触发页面横向滚动，同时破坏了body底部margin预留导航栏空间的布局平衡，导致导航栏被挤出可视区域。

解决方案 #

方案1：修改自定义类名避免冲突 #

把自定义的.row改成专属类名，比如.reminder-row：

.reminder-row {
    display: flex;
    align-items: center;
    border-bottom: 1px solid #bdbdbd;
    font-family: 'Montserrat', sans-serif;
    /* 可选：添加左右内边距避免内容贴边 */
    padding: 0 15px;
}

对应HTML替换类名：

<div class="reminder-row">
  <!-- 内部元素保持不变 -->
</div>

方案2：覆盖Bootstrap的.row默认样式 #

如果不想改类名，直接在自定义CSS中覆盖Bootstrap的负边距：

.row {
    display: flex;
    align-items: center;
    border-bottom: 1px solid #bdbdbd;
    font-family: 'Montserrat', sans-serif;
    /* 覆盖Bootstrap负边距 */
    margin-left: 0;
    margin-right: 0;
    /* 可选：添加内边距优化布局 */
    padding: 0 15px;
}

方案3：直接使用Bootstrap栅格系统 #

既然已经引入Bootstrap，利用它自带的栅格布局实现并排，避免自定义冲突：

{% block content %}
  {% for reminderInstance in Reminders %}
  <div class="row">
    <div class="col-xs-2"> <!-- 调整列宽适配按钮 -->
      <div class="CheckButton">
        <form action="{{ url_for('reminder', Plant_id = reminderInstance.Plant_id) }}">
          <button class="NewButton NewButton1"></button>
        </form>
      </div>
    </div>
    <div class="col-xs-10">
      <div class="ReminderDescription "> Give {{ reminderInstance.Plant_name }} water {{ reminderInstance.TimeSinceWaterNeeded }} days ago </div>
    </div>
  </div>
  {% endfor %}
{% endblock %}

可根据需求调整.CheckButton的margin-left等样式，适配栅格布局。

内容的提问来源于stack exchange，提问作者Teun