问如何在其对应的输入下显示输入验证错误？

EN

<ul>
    @foreach ($errors->all() as $error)
        <li>{{$error}}</li>
    @endforeach
</ul>
<div class="wrapper">
    <form action='{{ route('signin') }}' method='POST'>
        <label>Username</label>
        <input class='input' type='text' name='username' placeholder='Username' value='{{ Request::old('username') }}'>

        <label>Password</label>
        <input class='input' type='password' name='password' placeholder='Password' value='{{ Request::old('password') }}'>

        {{ csrf_field() }}
        <button class='Submit' type='submit'>Log In</button>
    </form>
</div>

public function signIn(Request $request){
        $this->validate($request, [
            'username' => 'required|max:120',
            'password' => 'required|min:5|max:12'
        ]);

        $username = $request['username'];
        $password = $request['password'];
        if (Auth::attempt(['username' => $username, 'password' => $password])){
            return redirect()->back();
        } else {
            return redirect()->back();
        }
    }