style your form in laravel using bootstrap

Hi Team

I need to style my form to have container has div card somehow its not displaying. But the style is right. How can i make this to be good UI?

@extends('layouts.app')

@section('content')
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-md-4">
                <div class="card">
                    <div class="card-header">{{ __('Register') }}</div>

                    <div class="card-body">
                        <form method="POST" action="{{ route('register') }}">
                            @csrf

                            <div class="mb-3">
                                <label for="name" class="form-label">{{ __('Name') }}</label>
                                <input id="name" type="text" class="form-control @error('name') is-invalid @enderror" name="name" value="{{ old('name') }}" required autocomplete="name" autofocus>

                                @error('name')
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $message }}</strong>
                                    </span>
                                @enderror
                            </div>

                            <div class="mb-3">
                                <label for="email" class="form-label">{{ __('E-Mail Address') }}</label>
                                <input id="email" type="email" class="form-control @error('email') is-invalid @enderror" name="email" value="{{ old('email') }}" required autocomplete="email">

                                @error('email')
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $message }}</strong>
                                    </span>
                                @enderror
                            </div>

                            <div class="mb-3">
                                <label for="password" class="form-label">{{ __('Password') }}</label>
                                <input id="password" type="password" class="form-control @error('password') is-invalid @enderror" name="password" required autocomplete="new-password">

                                @error('password')
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $message }}</strong>
                                    </span>
                                @enderror
                            </div>

                            <div class="mb-3">
                                <label for="password-confirm" class="form-label">{{ __('Confirm Password') }}</label>
                                <input id="password-confirm" type="password" class="form-control" name="password_confirmation" required autocomplete="new-password">
                            </div>

                            <div class="mb-3">
                                <button type="submit" class="btn btn-primary">
                                    {{ __('Register') }}
                                </button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection

//publix/css/custom.css

/* Custom styles for registration page */
.register-card {
  background-color: #f5f5f5;
  padding: 20px;
  border: 1px solid #ddd;
}

/* Custom styles for login page */
.login-card {
  background-color: #f5f5f5;
  padding: 20px;
  border: 1px solid #ddd;
}

//app_blade.php

<link rel="stylesheet" ="{{ asset('css/custom.css') }}">