移动端carousel-container等div无法占满宽度问题求助

我的网站仅在移动端设备上出现异常：carousel-container及其下方的div未占满屏幕宽度，尽管已为它们设置width:100%。以下是我的HTML、CSS代码及问题截图，恳请帮忙排查问题并指导修复。

我的HTML代码 #

<div id="header_row">
    <header>
        <img id="first" src="/modi_logo.png" alt="modi">
        <img id="second" src="/rrb_logo.png" alt="Logo">
        <h1>A website</h1>
        <img id="third" src="/murmu_logo.png" alt = "Logo">
    </header>

    <nav>
        <a id="icon_link"><label id="icon">
            <i class="fas fa-bars" style="color: #ffffff;"></i>            
        </label></a>
        <a id="about" href="#about">About</a>
        <a id="archive" href="#archives">Archive</a>
        <a id="admin" href="#admin">Admin</a>
    </nav>
</div><br><br><br><br><br><br><br><br>


<div style="width: 100%;">
    <div class="carousel-container">
        <div class="carousel-slide">
            <img src="/bihu.jpg" alt="Image 1">
        </div>
        <div class="carousel-slide">
            <img src="/bogibeel.jpg" alt="Image 2">
        </div>
        <div class="carousel-slide">
            <img src="/tea.jpg" alt="Image 3">
        </div>
        <div class="carousel-slide">
            <img src="/vande_bharat.jpg" alt="Image 4">
        </div>
    </div>
</div>
<div style="height: 20px; border: 2px solid rgb(52, 93, 226); background-color: rgb(99, 124, 204); width: 100%; box-sizing: border-box;"></div>


<div style="height: 100%;">
    <br>
    <div id="carousel-cont">
        <div id="prevButton" onclick="prevCard()"><span class="fas fa-arrow-left"></span></div>
            <div id="card-carousel">
                <div id="card-carousel-inner"></div>
            </div>
        <div id="nextButton" onclick="nextCard()"><span class="fas fa-arrow-right"></span></div>
    </div>
</div>

我的CSS代码 #

#carousel-cont {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: 10px;
    width: 95%; /* Adjust the width of the container */
    margin: 0 auto; /* Center the container */
    background-color: rgb(52, 93, 226);
    padding: 20px;
}

#prevButton, #nextButton {
    border-radius: 30%;
    font-size: large;
    cursor: pointer;
    background-color: rgb(99, 124, 204);
    color: white;
    border: 1px solid #ccc;
    padding: 5px 10px;
}

#card-carousel {
    width: 80%; /* Adjust the width of your cards */
    overflow: hidden;
    position: relative;
}

#card-carousel-inner {
    display: flex;
    transition: transform 0.5s ease-in-out;
    text-align: center;
    gap: 20px;
}
.card {
    flex: 0 0 23.333333%;
    width: 300px;
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.card-content {
    padding: 20px;
    word-wrap: break-word;
}

.card-content h2 {
    margin-bottom: 10px;
    font-size: 1.5rem;
    color: #333;
}

.card-content p {
    color: #666;
}

nav #icon{
    font-size: medium;
    line-height: 40px;
    float: left;
    margin-left: 30px;
    cursor: pointer;
}
#icon_link{
    display: none;
}
.button{
    background: #fff;
    padding: 10px 15px;
    color: #34495e;
    font-weight: bold;
    font-size: medium;
    border-radius: 5px;
    box-shadow: 6px 6px 29px -4px rgba(0,0,0,0.75);
    text-decoration: none;
    transition: 0.4s;
}
.button:active,#prevButton:active,#nextButton:active {
    transform: translateY(2px); /* Adjust the amount of translation based on your preference */
    box-shadow: 2px 2px 10px -2px rgba(0,0,0,0.75); /* Adjust shadow during active state */
}
.carousel-container {
    position: relative;
    margin:0 auto;
    width: 100%;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: rgb(79, 221, 231);
}

.popup{
    animation: slideInTop 0.5s ease-in-out;
    z-index: 2;
    background: rgba(0,0,0,0.6);
    width: 100%;
    height: 100%;
    position: absolute;
    top: 80px;
    display: none;
    justify-content: center;
    align-items: center;
    text-align: center;
}
.popup.slide-out {
    animation: slideOutBottom 0.5s ease-in-out; /* Animation duration and easing function for closing */
}
input{
    margin: 20px auto;
    display: block;
    width: 50%;
    padding: 8px;
    border: 1px solid gray;
}

.close,#close_menu{
    position: absolute;
    top: -15px;
    right: -15px;
    height: 30px;
    width: 30px;
    border-radius: 50%;
    box-shadow: 6px 6px 29px -4px rgba(0,0,0,0.75);
    cursor: pointer;
}
#close_about{
    position: absolute;
    top: 0; /* Adjusted from -15px to 10px */
    right: 0; /* Adjusted from -5px to 10px */
    height: 30px;
    width: 30px;
    border-radius: 50%;
    box-shadow: 6px 6px 29px -4px rgba(0, 0, 0, 0.75);
    cursor: pointer;
}
.popup-content{
    height: 250px;
    width: 500px;
    background: rgb(107, 126, 190);
    padding: 20px;
    border-radius: 5px;
    position: relative;
}
.carousel-slides {
    display: flex;
    width: 100%;
    overflow: hidden;
}

.carousel-slide {
    display: none;
    width: 100%;
    animation: fade 1.5s ease-in-out; /* Fade animation with a duration of 1.5 seconds */
}
.carousel-slide img {
    border: 2px solid black;
    width: 100%;
    height: 400px; /* Set the height to 100% of the viewport height */
    object-fit: cover;
}

header {
    border: 2px solid rgb(52, 93, 226);
    background-color: rgb(99, 124, 204);
    color: white;
    height: 80px;
    padding: 10px;
    text-align: center;
    display: flex;
    align-items: center; /* Vertically center items */
}

header img {
    height: 80px;
    margin-right: 10px;
}

#first {
    margin-right: auto; /* Pushes the first image to the extreme left */
}

#second {
    margin-right: 20px; /* No margin on the right for the second image */
    margin-left: 0; /* No margin on the left for the second image */
}

header h1 {
    margin: 0; /* No margin for the h1 element */
}

#third {
    margin-left: auto; /* Pushes the third image to the extreme right */
}
nav {
    background-color: rgb(55, 83, 173);
    overflow: hidden;
    display: flex;
    justify-content: space-around; /* Evenly distribute child elements */
}

nav a {
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    flex: 1; /* Equal distribution of space among child elements */
    position: relative; /* Added relative positioning */
    transition: background-color 0.3s ease; /* Added smooth transition effect */
}

nav a:hover, .popup a:hover {
    background-color: rgb(107, 126, 190); /* Adjust the background color and opacity as needed */
}

#header_row{
    position: fixed; 
    width: 100%; 
    z-index: 20;
}

问题截图 #

如图中红色标记所示，carousel-container和其下方的div未占满宽度，该问题仅出现在移动端设备上，烦请帮忙找出问题所在并指导修复。

问题原因分析 #

• 缺少移动端视口设置：移动端浏览器默认会以桌面端视口宽度（通常是980px）渲染页面，导致元素的width:100%是基于这个宽计算，而非设备实际宽度，出现横向留白。
• 全局盒模型未统一：部分元素的padding、border未纳入宽度计算，可能导致容器超出父元素范围或被挤压。
• header元素移动端溢出：header内的图片和标题在小屏幕下总宽度超过容器，间接导致页面出现横向滚动条，视觉上让下方元素看起来未占满宽度。

修复方案 #

1. 添加视口元标签 #

在HTML的<head>标签中添加以下代码，强制移动端浏览器使用设备自身宽度作为视口：

<meta name="viewport" content="width=device-width, initial-scale=1.0">

2. 统一全局盒模型 #

在CSS最顶部添加全局样式重置，确保所有元素的padding和border都包含在width计算内：

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

3. 调整carousel-container样式 #

移除多余的居中margin，确保容器完全贴合父元素：

.carousel-container {
    position: relative;
    margin: 0;
    width: 100%;
    overflow: hidden; /* 防止图片溢出触发横向滚动 */
}

4. 适配移动端header布局 #

添加媒体查询，缩小移动端下header内的图片和标题尺寸，避免溢出：

@media (max-width: 768px) {
    header h1 {
        font-size: 1rem;
    }
    header img {
        height: 50px;
        margin-right: 5px;
    }
}

内容的提问来源于stack exchange，提问作者user21917572