使用@media技术实现PC端的自适应，只需要注意几个细节即可。

我们首先编写一个div块。

示例代码如下：

<style>
        .Header{
            width: 1000px;
            background: antiquewhite;
        }
</style>
<div class="Header">1.主要元素（头部、导航栏、底部）可以堆满屏幕的宽度。</div>

效果：

此时的div块存在以下问题：

1.块宽度没有铺满浏览器。

2.块没有居中。

3.块与浏览器边缘存在间距。

因此要想实现PC端的自适应，就必须消除以上存在的三个问题。

1.解决办法：使块宽度铺满浏览器。

<style>
        .Header{
            width: auto;/*使块铺满浏览器*/
            background: antiquewhite;
        }
</style>
<div class="Header">1.解决办法：使块宽度铺满浏览器。</div>

2.解决办法：在块内再包裹一个块，让外块宽度铺满浏览器，让内块居中。

    <style>
        .Header{
            width: auto;/*使块铺满浏览器*/
            background: antiquewhite;
        }
        .Header-Content{
            width:600px;
            margin: 0px auto;/*使块居中*/
            background: aqua;
        }
    </style>
    <div class="Header">
        <div class="Header-Content">
            2.解决办法：在块内再包裹一个块，让外块宽度铺满浏览器，让内块居中。
        </div>
    </div>

3.消除常用标签的默认CSS样式

html,body,div,p,ul,li,ol,a,b,input,span,strong,form,button{
            margin: 0;
            padding: 0;
            border: 0;
}

最后效果如图：不管屏幕宽度如何，该div块都实现了自适应，能够随着屏幕宽度自动铺满，并且内块始终居中。

完整代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>PC端自适应</title>
    <style>
        html,body,div,p,ul,li,ol,a,b,input,span,strong,form,button{
            margin: 0;
            padding: 0;
            border: 0;
        }
        .Header{
            width: auto;
            background: antiquewhite;
        }
        .Header-Content{
            width:600px;
            margin: 0px auto;
            background: aqua;
        }
    </style>
</head>
<body>
    <div class="Header">
        <div class="Header-Content">
            1.主要元素（头部、导航栏、底部）可以堆满屏幕的宽度。
        </div>
    </div>
</body>
</html>

< >

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