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在 laravel 当中，如果遇到 404 错误，一般都是默认的报错页面，如果想替换成自己的页面，网上有些教程都是建议修改框架内容，这将导致后续升级版本时候，又会被覆盖问题。
其实官方有一个很方便的路由方法：fallback，可以优雅的完成 404 页面覆盖。
Route::fallback(function (){return view('errors.404');
});fallback 可以为所有未匹配到的路由默认一个执行方法，同时我们也可以在这个方法内做一些日志记录，用于查看一些非法访问等等。
如果你有多个用户组，设置不同的 404 逻辑，那么也可以对不同的组，单独设置 404，如下类似：
Route::prefix('admin')->group(function (){Route::fallback(function (){return view('admin.errors.404');
});
});设置好跳转逻辑之后，我们就可以在模板文件下新建一个页面来接管这些未匹配的页面了，下面为大家提供一个 tailwindcss 写的模板页面代码：
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>404</title>
<link href="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/tailwindcss/2.0.3/tailwind.min.css" rel="stylesheet">
</head>
<body>
<div class="h-screen w-screen bg-gray-100 flex items-center">
<div class="container flex flex-col md:flex-row items-center justify-center px-5 text-gray-700">
<div class="max-w-md">
<h1 class="text-9xl font-dark font-bold">404</h1>
<p class="text-2xl md:text-3xl font-light leading-normal"> 当前访问的页面不存在！</p>
<p class="mb-8"> 请返回首页，或者关闭窗口！</p>
<a href="{{url('/') }}" class="px-4 inline py-2 text-sm font-medium leading-5 shadow text-white transition-colors duration-150 border border-transparent rounded-lg focus:outline-none focus:shadow-outline-blue bg-blue-600 active:bg-blue-600 hover:bg-blue-700">
返回首页
</a>
</div>
<div class="max-w-lg">
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