HTML/CSS实现标题与按钮跨屏幕同排对齐问题求助

我是Web开发专业的学生，目前在做项目开发。页面里有两个元素：带渐变效果的标题（类名subheading gradient-text）和按钮（类名next-button），需要它们在页面底部同一行显示，标题左对齐、按钮右对齐。这个效果在我个人笔记本上正常，但在校园笔记本上元素位置错位，没法保持同排。

原代码如下：

原CSS代码 #

.subheading {
    font-family: 'Georgia', cursive;
    font-size: 30px;
    font-weight: 9000;
    line-height: 1.5;
    padding-left: 150px;
    margin: 0; 
    margin-left: 10px;
    margin-top: 80px;
}

.gradient-text {
    font-size: 30px;
    font-weight: 9000;
    background: linear-gradient(270deg, #5b42f3, #ff00a0, #ffcc00, #5b42f3);
    background-size: 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-animation 5s ease infinite;
    margin: 0;
    line-height: 1.5;
    letter-spacing: 0.08em;
    margin-left: 10px;
    margin-top: 80px;
}

@keyframes gradient-animation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.next-button {
    position: fixed;
    bottom: 157px;
    right: 375px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 1px;
    font-family: 'Georgia', cursive;
    color: rgb(19, 9, 9);
    font-weight: bold;
    text-decoration: none;
    border-radius: 6px;
    padding: 3px 6px;
    transition: background-color 0.3s;
}

.next-button svg {
    width: 30px;
    height: 30px;
}

.next-button:hover {
    color: rgb(155, 55, 9);
    font-weight: bold;
}

.next-button:hover svg {
    stroke: rgb(155, 55, 9); 
}

原HTML代码 #

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h2 class="subheading gradient-text"> Lorem ipsum </h2> 

    <a href="home.html" class="next-button">
        Continue 
        <svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <polyline points="9 18 15 12 9 6" />
        </svg>
    </a>    
</body>
</html>

1. 按钮使用position: fixed并硬编码bottom: 157px、right: 375px，不同屏幕分辨率下固定像素值会导致位置偏移
2. 标题的padding-left、margin-left为固定像素，没有和按钮的布局关联，无法保证两者在同一水平线
3. 两个元素无共同容器约束布局，独立的定位逻辑导致跨设备适配失效
4. 原代码中font-weight: 9000无效，CSS字体粗细最大值为900

通过新增容器并使用Flex布局，实现自适应的底部两端对齐效果：

修改后的HTML代码 #

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="bottom-bar">
        <h2 class="subheading gradient-text"> Lorem ipsum </h2> 

        <a href="home.html" class="next-button">
            Continue 
            <svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                <polyline points="9 18 15 12 9 6" />
            </svg>
        </a>    
    </div>
</body>
</html>

修改后的CSS代码 #

/* 底部容器：固定在页面底部，Flex实现两端对齐 */
.bottom-bar {
    position: fixed;
    bottom: 20px;
    left: 0;
    right: 0;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.subheading {
    font-family: 'Georgia', cursive;
    font-size: 30px;
    font-weight: 900;
    line-height: 1.5;
    margin: 0;
}

.gradient-text {
    font-size: 30px;
    font-weight: 900;
    background: linear-gradient(270deg, #5b42f3, #ff00a0, #ffcc00, #5b42f3);
    background-size: 400%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-animation 5s ease infinite;
    margin: 0;
    line-height: 1.5;
    letter-spacing: 0.08em;
}

@keyframes gradient-animation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.next-button {
    display: flex;
    align-items: center;
    gap: 1px;
    font-family: 'Georgia', cursive;
    color: rgb(19, 9, 9);
    font-weight: bold;
    text-decoration: none;
    border-radius: 6px;
    padding: 3px 6px;
    transition: color 0.3s;
}

.next-button svg {
    width: 30px;
    height: 30px;
}

.next-button:hover {
    color: rgb(155, 55, 9);
    font-weight: bold;
}

.next-button:hover svg {
    stroke: rgb(155, 55, 9); 
}

• 新增bottom-bar容器，用position: fixed固定在底部，flex布局的justify-content: space-between实现两端对齐，确保元素始终同排
• 移除标题和按钮的硬编码固定像素位置/间距，改用容器的padding控制边距，适配不同屏幕
• 修正无效的font-weight: 9000为有效值900
• 修正按钮的transition属性，使其与hover效果匹配，保证过渡流畅

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