HTML/CSS文本与搜索栏堆叠布局问题求助

问题根源 #

• 页面body使用了display: flex且默认flex-direction: row，导致<h1>和搜索栏容器.overlay-content被当作横向排列的flex子元素，出现并排效果。
• align-items: center让所有flex子元素垂直居中，加上h1的大字号，导致搜索栏顶部被遮挡。
• 搜索栏样式里的overflow: scroll和无效的overflow-y: center属性多余，影响正常显示。
• 原代码重复定义了.container样式，造成样式冲突。

修复方案 #

1. 将<h1>和.overlay-content包裹到统一的.main-content容器中，设置该容器为垂直flex布局，让内部元素从上到下堆叠。
2. 调整body的flex设置，确保整个页面内容垂直居中，同时内部容器保持垂直流。
3. 清理重复CSS样式，修正搜索栏的样式属性，保证显示正常。
4. 调整h1的margin值，确保和搜索栏之间有合适间距。

修改后的完整代码 #

<!DOCTYPE html>
<html>
<head>
    <title>My Page</title>
    <style>
        html, body { 
            height: 100%;
            margin: 0;
            padding: 0;
        }

        body {
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #f9f9f9;
        }

        .main-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 100%;
        }

        .background {
            position: absolute;
            top: 0;
            bottom: 0;
            left: 0;
            right: 0;
            background-color: #000000;
            z-index: -1;
        }

        h1 {
            font-family: 'Space Mono', monospace;
            font-size: clamp(3rem, 10vw, 10rem);
            color: white;
            padding: 0rem clamp(1rem, 2vw, 3rem);
            border-radius: clamp(0.4rem, 0.75vw, 1rem);
            text-align: center;
            margin: 0 0 30px 0;
        }

        #mySearch {
            display: block;
            width: 50%;
            min-width: 300px;
            font-size: 18px;
            padding: 11px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
            box-sizing: border-box;
        }

        #myMenu {
            list-style: none;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
        }

        .game {
            width: 200px;
            height: 310px;
            border-radius: 8px;
            cursor: pointer;
            border: 1px solid white;
            display: flex;
            flex-direction: column;
        }

        .game:hover {
            border: 1px solid #674ea7;
        }

        .gameimg {
            width: 100%;
            height: 265px;
            border-bottom: 1px solid white;
            border-radius: 8px 8px 0px 0px;
            object-fit: cover;
        }

        .gameinfo {
            width: 100%;
            text-align: center;
            overflow: hidden;
            text-overflow: ellipsis;
            color: white;
            font-size: 16px;
            line-height: 35px;
            margin: 0;
        }
    </style>
</head>
<body>
    <div class="main-content">
        <h1 data-value="GAMES">GAMES</h1>

        <div class="overlay-content">
            <form action="/action_page.php">
                <input type="text" placeholder="Search.." name="search" id="mySearch" onkeyup="myFunction()" title="Type in a category">
                <ul id="myMenu">
                    <li>
                        <div class="game" onclick="goto(),acilspace()">
                            <img src="" class="gameimg">
                            <p class="gameinfo">Acilspace</p>
                        </div>
                    </li>
                    <li>
                        <div class="game" onclick="goto(),astriods()">
                            <img src="" class="gameimg">
                            <p class="gameinfo">Astriods</p>
                        </div>
                    </li>
                    <li>
                        <div class="game" onclick="goto(),vex5()">
                            <img src="" class="gameimg">
                            <p class="gameinfo">Vex 5</p>
                        </div>
                    </li>
                    <li>
                        <div class="game" onclick="">
                            <img src="" class="gameimg">
                            <p class="gameinfo">c</p>
                        </div>
                    </li>
                </ul>
            </form>
        </div>
    </div>

    <canvas class="background"></canvas>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/particlesjs/2.2.2/particles.min.js"></script>
    <script>
        var particles = Particles.init({
            selector: '.background',
            sizeVariations: 3,
            color: ['#949398', '#674ea7'],
            connectParticles: true
        });

        function myFunction() {
            var input, filter, ul, li, p, i;
            input = document.getElementById("mySearch");
            filter = input.value.toUpperCase();
            ul = document.getElementById("myMenu");
            li = ul.getElementsByTagName("li");
            for (i = 0; i < li.length; i++) {
                p = li[i].getElementsByClassName("gameinfo")[0];
                if (p.innerText.toUpperCase().indexOf(filter) > -1) {
                    li[i].style.display = "";
                } else {
                    li[i].style.display = "none";
                }
            }
        }
        
        const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        let interval = null;

        document.addEventListener("DOMContentLoaded", () => {
            const h1 = document.querySelector("h1");
            const targetValue = h1.dataset.value;
            let iteration = 0;
            
            clearInterval(interval);
            
            interval = setInterval(() => {
                h1.innerText = h1.innerText
                    .split("")
                    .map((letter, index) => {
                        if(index < iteration) {
                            return targetValue[index];
                        }
                    
                        return letters[Math.floor(Math.random() * 26)]
                    })
                    .join("");
                
                if(iteration >= targetValue.length){ 
                    clearInterval(interval);
                }
                
                iteration += 1 / 3;
            }, 75);
        });
    </script>
</body>
</html>

额外优化说明 #

• 新增.main-content容器，通过flex-direction: column实现h1和搜索栏的垂直堆叠。
• 修正搜索栏宽度设置，添加min-width保证小屏幕可用性，移除无效的overflow属性。
• 游戏列表改用flex-wrap实现响应式排列，替换原float布局，符合现代CSS规范。
• 将.gameinfo从<a>标签改为<p>标签，语义更合理，同步调整搜索过滤逻辑适配该修改。

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