为何Carousel Div与NavBar同行显示？如何解决该布局问题？

我有一个基础HTML落地页模板，头部为NavBar导航栏，主体包含用于展示各类图标的Carousel轮播组件。目前二者意外同行显示（如下图所示）：

我需要将二者分开展示，即NavBar作为页头，Carousel作为主体部分。相关代码如下：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
    <link rel="stylesheet" th:href="@{/css/landing.css}">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.0.0/dist/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <link href="https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css" rel="stylesheet">
</head>
<body>

<div class="container-fluid">
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <a class="navbar-brand" href="#"><img th:src="@{/images/logo1.png}" alt="Logo" /></a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse justify-content-end " id="navbarNav">
            <ul class="navbar-nav">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">About Us</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">View Applications</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Log Out</a>
                </li>
            </ul>
        </div>
    </nav>
</div>

<div class="body">
    <div class="carousel" style="display:block; padding-top:50px;">
        <div class="images">
            <img th:src="@{/images/EV Station Locator.jpeg}" alt="EV Station" />
            <img th:src="@{/images/Green Energy.jpeg}" alt="Energy" />
            <img th:src="@{/images/Smart Parking.jpeg}" alt="Parking" />
            <img th:src="@{/images/Smart Purifications.jpeg}" alt="Purification" />
            <img th:src="@{/images/Waste Management.jpeg}" alt="Waste" />
        </div>
    </div>
</div>

</body>
</html>

问题原因与解决方案 #

出现同行显示的核心问题是CSS引用顺序错误，你把自定义的landing.css放在了Bootstrap CSS之前，导致Bootstrap的默认样式覆盖了你的自定义布局规则；另外可能是自定义CSS中给.body或.carousel设置了float、display: inline等属性，破坏了块级元素的默认布局。

修复步骤：

• 调整CSS引用顺序：将Bootstrap CSS放在自定义CSS之前，确保自定义样式能够正确覆盖框架样式
• 检查自定义CSS规则：确认.body类没有设置float或display: inline/inline-block，保留默认的display: block以占据整行
• 移除冗余内联样式：.carousel的display:block可以删除，因为<div>元素默认就是块级

修改后的完整代码 #

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
    <!-- 先引入Bootstrap框架样式 -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.0.0/dist/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <!-- 再引入自定义样式 -->
    <link rel="stylesheet" th:href="@{/css/landing.css}">
    <link href="https://unpkg.com/boxicons@2.1.4/css/boxicons.min.css" rel="stylesheet">
</head>
<body>

<div class="container-fluid">
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <a class="navbar-brand" href="#"><img th:src="@{/images/logo1.png}" alt="Logo" /></a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse justify-content-end " id="navbarNav">
            <ul class="navbar-nav">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">About Us</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">View Applications</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Log Out</a>
                </li>
            </ul>
        </div>
    </nav>
</div>

<div class="body">
    <div class="carousel" style="padding-top:50px;">
        <div class="images">
            <img th:src="@{/images/EV Station Locator.jpeg}" alt="EV Station" />
            <img th:src="@{/images/Green Energy.jpeg}" alt="Energy" />
            <img th:src="@{/images/Smart Parking.jpeg}" alt="Parking" />
            <img th:src="@{/images/Smart Purifications.jpeg}" alt="Purification" />
            <img th:src="@{/images/Waste Management.jpeg}" alt="Waste" />
        </div>
    </div>
</div>

</body>
</html>

内容的提问来源于stack exchange，提问作者Syed